Table of Contents
Rhodiola Rosea L. (Golden Root, Roseroot, Arctic Root) is an adaptogenic herb and nootropic that has been used in traditional medicine in Russia and Scandinavian countries for hundreds of years.
In Russia, Rhodiola Rosea is widely used as a remedy for fatigue, poor concentration, and decreased memory. It’s also believed to make workers more productive.
The Journal of the American Botanical Council reported on 180 studies done on Rhodiola Rosea since 1960. The bulk of the research shows how this herb works in treating physical endurance, fatigue, depression, impotence, infections, fertility, cold and flu, tuberculosis, cancer, and anxiety.[i]
German researchers describe the benefits of Rhodiola Rosea for pain, headache, scurvy, hemorrhoids, as a stimulant, and as an anti-inflammatory.[ii]
This ancient remedy has remarkable stress-relieving and anti-anxiety properties. And stands shoulder to shoulder with some of the most potent drugs used to treat depression and anxiety.
Here we’re going to explore how Rhodiola Rosea benefits your brain.
Rhodiola Rosea helps:
- Reduce Stress and Fatigue: Rhodiola Rosea helps reduce stress and fatigue, increase energy, alertness and stamina, while boosting mental performance under periods of chronic stress. Research shows Rhodiola Rosea can increase attention to detail-oriented tasks by improving concentration over a prolonged period. The ideal study nootropic.
- Improve Mood. Rhodiola Rosea boosts mood by influencing serotonin and norepinephrine levels in your brain, and the feel-good opioids like beta-endorphins.
- Neuronal Regeneration: Rhodiola Rosea helps in neurogenesis by repairing and growing new neurons. It also activates the synthesis and re-synthesis of ATP, your body and brain cell’s main energy source. Rhodiola Rosea helps reduce the inflammatory C-reactive protein. And salidroside, one of many components of this incredible herb, protects neurons from oxidative stress-induced cell death.
Overview
Rhodiola Rosea L. (Golden Root, Roseroot, Arctic Root) has been used for several thousand years in traditional medicine. It grows in primarily dry sandy ground at high altitudes in the arctic areas of Europe and Asia.
The plant is 12 – 30 inches high and produces yellow blossoms. The Greek physician, Dioscorides, first recorded the medicinal applications of ‘rodia riza’ in 77 C.E. in De Materia Medica.[iii]
This ancient herbal adaptogen has remarkable anti-depressant and anti-anxiety qualities. And has been shown to be as good as many prescription pharmaceuticals in treating depression and anxiety.
In total, Rhodiola Rosea contains 140 compounds in the roots and rhizome. The critical components include rosavin, rosarian, and rosin, collectively known as rosavins.
Certain chemicals must be present for Rhodiola Rosea to work. And these include rosavin, rosarin, rosin, salidroside, and tyrosol. The first 3 of these compounds are found only in Rhodiola Rosea. It takes a synergistic combination of these chemicals for this herb to be effective.
To ensure the supplement you choose works and contains pure Rhodiola Rosea, it needs to be standardized to contain at least 3% rosavins and 1% salidroside. This is the ratio found in the natural root. (See more about selecting the right Rhodiola Rosea supplement in “Type of Rhodiola Rosea to buy” later in this article).
Studies on organs, tissues, cells and enzymes show that Rhodiola Rosea extracts exhibit adaptogenic effects that are neuroprotective, cardio protective, anti-fatigue, anti-depressive, anxiolytic, nootropic, and has life-extension qualities.[iv]
Rhodiola Rosea is known as an adaptogen. Which means it helps your body adapt to stress, both mental and physical.
How does Rhodiola Rosea work in the Brain?
Rhodiola Rosea boosts brain health and function in several ways. But two in particular stand out.
- Rhodiola Rosea enhances mood. Reports from the nootropics community, and data from clinical trials show that Rhodiola Rosea encourages a balanced mood.
One double-blind, placebo-controlled trial worked with male and female subjects aged 18 – 70 years. All were diagnosed with mild to moderate depression.
One group received two 340 mg tablets of Rhodiola Rosea extract (SHR-5) daily. A second group received double the dose of the first group per day. And the third group received a placebo daily.
The efficacy of SHR-5 extract for depression complaints was assessed on the first day. And again on day 42 of the trial. The research team reported that Groups A and B saw significant improvements in depression, insomnia, emotions and overall quality of life.
The team concluded that Rhodiola Rosea extract has potent anti-depressant qualities in those with mild to moderate depression. When administered in doses of either 340 or 680 mg per day over 6-weeks.[v]
- Rhodiola Rosea improves mental performance under stress. Mental fatigue can cause brain fog, and make it hard to focus. It can affect your performance at school, and on the job.
Rhodiola Rosea stimulates your nervous system to fight fatigue that stifles mental clarity. And studies show it even saves injured neurons. And encourages the growth and development of brain cells.
One animal study in China explored the effects of Rhodiola Rosea on the number of neurons in the hippocampus of rats with depression induced by chronic stress.
This study has a direct correlation on how Rhodiola Rosea works in the human brain. And its value as a nootropic. In this study, 50 rats were divided into 5 groups: normal control, untreated, negative control, positive control and Rhodiola Rosea-treated groups.
The research team found that the number of neurons in the hippocampus in the Rhodiola Rosea-treated group were increased and recovered to normal level.
The study concluded that Rhodiola Rosea promotes the proliferation and differentiation of neural stem cells in the hippocampus. And may play a role in saving injured neurons of the hippocampus.[vi]
How things go bad
Chronic stress and cortisol can damage your brain. Neuroscientists at the University of California, Berkeley, found that chronic stress triggers long-term changes in brain structure and function.[vii]
Chronic stress changes neural networks. Cortisol creates a domino effect that hard-wires pathways between the hippocampus and amygdala. (The amygdala (lizard brain) is the area responsible for your fight-or-flight response).
This hard-wiring caused by stress is not the way the brain was designed. But chronic, ongoing stress tricks the brain into rebuilding circuits and hunkering down for the long haul.
This re-wiring appears to be permanent. Unless you intervene with something like Rhodiola Rosea.
Chronic stress seems to ‘flip a switch’ in stem cells in the brain. And turns them into a type of cell that prevents connections to the prefrontal cortex. Preventing improved learning and memory.
And laying down the scaffolding linked to anxiety, depression and PTSD (Post Traumatic Stress Disorder).
↓ Chronic stress reduces levels of serotonin and norepinephrine
↓ Chronic stress reduces the number of neurons
↑ Anxiety and depression increases
↓ Chronic stress induces brain fog and memory loss
Under conditions of chronic stress and excess cortisol you experience mental and physical fatigue.
Rhodiola Rosea benefits
Rhodiola Rosea undoes damage to your brain caused by chronic stress. It helps keep it healthy. And even improves your body and brain’s response to stress.
Rhodiola Rosea relieves stress by balancing your body’s stress-response system. And helps your body return to a relaxed state by influencing key brain chemicals like serotonin, norepinephrine and beta-endorphins (opioid neuropeptides).[viii]
Rhodiola Rosea can also help prevent and repair damage caused by C-reactive protein and free radicals.
Rhodiola Rosea even provides protection and regeneration of neurons during periods of stress. It helps in the synthesis and resynthesis of ATP. The main fuel source for the mitochondria in your cells.
Any kind of fatigue you experience – regardless of source – Rhodiola Rosea is like your “magic bullet”. Mood, energy, stamina and concentration can all increase with a dose of this herb.
Many neurohackers even report improved libido and sexual performance when using Rhodiola Rosea.
If you get an effective dose of real standardized Rhodiola Rosea extract, you should experience an effect.
How does Rhodiola Rosea feel?
The time required to begin feeling the effects of Rhodiola Rosea depends on your genetics, mental and physical condition, environment, behavior and lifestyle.
Some neurohackers report feeling its effects in just a few days. While others require as much as 3 weeks. Clinical studies show that most people experience the full benefits of Rhodiola Rosea in 30 – 40 days.
If you don’t notice a change within 40 days, Rhodiola Rosea may not be effective for you.
Many report that Rhodiola Rosea provides a pronounced anti-anxiety effect. Depression lifts and overall quality of life improves.
Rhodiola Rosea should give you an energy lift. It could improve your mood, focus, level of concentration and alertness.
Rhodiola Rosea Clinical Research
Rhodiola Rosea has a reputation in the nootropic community for its energizing and anti-fatigue qualities.
One double-blind, placebo-controlled trial was carried out with 161 cadets aged from 19 – 21 years. The intent was to measure the effect of a single dose of Rhodiola Rosea extract (SHR-5) on capacity for mental work against a background of fatigue and stress.
An additional objective was to try two different doses of the extract. The other dose being 50% higher. So the cadets were given either 2 or 3 capsules of Rhodiola Rosea extract.
The study showed a “pronounced anti-fatigue effect” in the cadets. With no significant differences between the two dosage groups. But there was a “possible trend in favor of the lower dose” in the cognitive tests.[ix]
Rhodiola Rosea as a nootropic
The aim of this study was to investigate the effect of repeated low-dose treatment of Rhodiola Rosea extract (SHR-5) on mental performance with fatigued physicians.
The researchers recruited a group of 56 healthy, young physicians working night duty at the Armenian State Medical University. Tests involved overall level of mental fatigue, associative thinking, short-term memory, calculation, ability of concentration, and speed of audio-visual perception.
Tests were done before and after night duty during 3 periods of 2 weeks each. The young doctors received Rhodiola Rosea extract tablets or a placebo for the first 2 weeks. Followed by a 2 week ‘washout’ period. And finishing with another 2 weeks of Rhodiola Rosea extract tablets or a placebo.
The research team found a statistically significant improvement in cognitive tests during the first 2 weeks. No side effects were reported. And the young doctors had a reduction in general fatigue under stressful conditions.[x]
Rhodiola Rosea as an antidepressant
One study published in Phytomedicine was run as a “proof of concept” trial to evaluate the efficacy of using Rhodiola Rosea compared to the anti-depressant ‘sertraline’ for major depressive disorder.
Sertraline (Zoloft©) is a pharmaceutical SSRI used to treat depression, anxiety, panic attacks, and obsessive-compulsive disorder (OCD). And it comes with a host of side effects including fatigue, diarrhea, anorexia, convulsions, confusion, decreased libido, and ejaculation failure.
This trial recruited 57 people diagnosed with depression. They were given standardized Rhodiola Rosea extract, sertraline, or a placebo for 12 weeks. 3 different depression scoring tests were used during the trial.
The researchers concluded that Rhodiola Rosea produced less antidepressant effect than sertraline, but it also resulted in “significantly fewer adverse events and was better tolerated.”
The research team concluded that even though Rhodiola offered slightly less anti-depressant benefits, it possessed “a more favorable risk to benefit ratio for those with mild to moderate depression”.[xi]
Rhodiola Rosea Recommended Dosage
Recommended dose of Rhodiola Rosea is 150 – 200 mg per day.
Look for an extract that is standardized to contain rosavins and salidrosides in a 3:1 ratio. This mimics the ratio of these compounds that naturally occur in Rhodiola Rosea root.
No additional benefit seems to come from taking more than 1,000 mg per day.
Rhodiola Rosea Side Effects
Rhodiola Rosea is a natural adaptogen and herb that has been used successfully for thousands of years. It’s considered non-toxic and safe. And very few side effects have been reported.
Considerably higher than recommended doses could result in dry mouth, nausea, upset stomach, headache, insomnia and weight loss.
Since Rhodiola Rosea acts as a Monoamine Oxidase Inhibitor (MAOI), you should not use it if you’re taking MAOI meds. MAOI’s are a type of anti-depressant drug used to treat bipolar disorder, panic disorder, social anxiety disorder and PTSD.
MAOI meds influence serotonin levels in the brain. So taking MAOI’s in combination with Rhodiola Rosea has the potential to cause serotonin syndrome.
Type of Rhodiola Rosea to buy
Rhodiola Rosea is available as a powder, capsules, tablets and tea.
Active ingredients of Rhodiola Rosea include rosavins and salidrosides. Make sure you look for the percentage of active ingredients listed on the bottle or package.
Ideally you’re looking for a 3:1 ratio of rosavins and salidrosides. This mimics the ratio of these compounds naturally occurring in the Rhodiola Rosea root.
Rhodiola Rosea can sometimes be found in some of higher quality pre-formulated nootropic stacks. For example, Mind Lab Pro® contains 11 brain enhancing nootropic compounds including Rhodiola Rosea (standardized to 3% rosavins, and 1% salidrosides).
I recommend Mind Lab Pro because it addresses all aspects of anxiety resistance, memory and cognitive enhancement, stabilizes mood, brain repair, and maintenance.
This premium nootropic stack is designed to affect neurotransmitters, cognitive energy, brain waves, neuroprotection, and regeneration. See my Mind Lab Pro review for a detailed report.
Now this is where it gets tricky if you choose to buy individual Rhodiola supplements. And probably the reason why some forum threads and user reviews report no effect from using Rhodiola Rosea.
In the late 1980’s, demand for Rhodiola Rosea-based phytomedicines dramatically increased. The wild-grown, raw material was over-harvested, resulting in a steady decline in the quality and effectiveness of Rhodiola Rosea.
Studies revealed that other species of genus Rhodiola were being substituted for Rhodiola Rosea. While some of these mixed batches were highly variable in quality, others had no pharmacological or nootropic effect.[xii]
The American Botanical Council has more on Rhodiola Rosea and problems with adulterants in this extensive report.
So do your best to find out where the supplement maker gets their raw Rhodiola Rosea. Hostile environments like Siberia seem to produce higher quality Rhodiola Rosea.
The active ingredients for most nootropic benefit include; Rosavin, Rosaridin, Rosarin, Rosin, Salidroside, and Tyrosol. The first 3 are collectively referred to as “rosavins”. And the other big one is “salidroside” which has several iterations.
Avoid supplements that list “other ingredients” on the label. And look for Certified Organic to ensure the root used to make your Rhodiola Rosea supplement is free of heavy metals, pesticides and herbicides.
Nootropics Expert Recommendation
Rhodiola Rosea Extract 150 – 200 mg per day
I recommend using Rhodiola Rosea as a nootropic supplement.
Your body does not make Rhodiola Rosea on its own. So to get its benefits you must take it as a supplement.
Rhodiola Rosea is especially helpful for those suffering from anxiety and stress. Studies show it helps stop and reverse the devastating effects of stress in your brain, and body. This nootropic helps repair the damage to neurons caused by chronic stress.
Rhodiola Rosea is a powerful adaptogen. Which means it helps increase the effect of certain hormones when activity is low. And will block excess stimulation when activity is too high.
Rhodiola Rosea as an adaptogen helps balance norepinephrine in the body caused by chronic stress. It also boosts serotonin and the feel-good opioid chemical beta-endorphins.
Using Rhodiola Rosea can help eliminate brain fog, increase concentration during brutal periods like exams or business presentations, boost energy by increasing the ATP synthesis in your mitochondria, and protect your brain cells from free radical damage.
Rhodiola Rosea helps alleviate mental and physical fatigue, improves stress response, and provides better quality of sleep. It can even help out your sex life.
Rhodiola Rosea is especially helpful for those suffering from anxiety and panic disorders. Studies have shown the calming effect of this herb was equal to some popular antidepressant and anti-anxiety drugs. Without the side effects.
You can safely take up to 600 mg of Rhodiola Rosea extract daily if needed. Most get all the benefit they need with 150 – 200 mg. Half of the dose in the morning, and another early afternoon.
And make sure your getting genuine Rhodiola Rosea extract with a 3:1 ratio of rosavins and salidrosides. Read the user reviews and labels.
You can buy individual Rhodiola Rosea supplements. Or you could try my favorite pre-formulated nootropic stack Mind Lab Pro® which includes Rhodiola Rosea (standardized to 3% rosavins, and 1% salidrosides).
Mind Lab Pro contains a synergistic blend of 11 brain enhancing nootropics covering all aspects of cognition and brain health. See my full Mind Lab Pro review for more.
Join The Discussion - 329 comments
Christopher Drennen
August 5, 2021
Rhodiola acts as a MAOI. That raises a lot of red flags for me. MAOIs are known to interact negatively with many other drugs and foods. Are there any other nootropics I should avoid if I am taking Rhodiola? Is there a problem with taking Tryptophan and Rhodiola together considering that they both increase sorotonin?
David Tomen
August 7, 2021
Christopher, several nootropic supplements act as an MAOI which is part of their benefit. There are some prescription meds that you should not combine with an MAOI because it you could have a hypertensive crisis (heart attack) or Serotonin Syndrome.
That’s why I’m always reminding people to clearly understand the mechanism of action for everything that they are considering using.
But there are very few supplements that are contraindicated with other nootropics that act like an MAOI. St. John’s wort is the only one I can think of off the top. There is nothing fundamentally unsafe about combining Tryptophan with Rhodiola Rosea. But some will react badly to it.
Christopher Drennen
August 7, 2021
Thanks for the response. I know that SSRIs work on serotonin, and I read what you said about serotonin syndrome. But there is another antidepressant, Wellbutrin, that works more on dopamine and norepinephrine. Would Wellbutrin be contraindicated with any of the nootropics you write about?
David Tomen
August 8, 2021
Rhodiola Rosea and Wellbutrin both affect catecholamine levels in your brain. There is no benefit I can think of for combining Rhodiola with Wellbutrin.
And Tryptophan is usually used before bed. Many hours after you take Wellbutrin assuming you use it during the day. You should be using L-Tyrosine, ALCAR and Alpha GPC or Citicoline to support Wellbutrin use.
Paolo
July 17, 2021
Dear David, SSRI act on serotonin and cause so many sexual problems, libido zero, erectile deficit, orgasm difficulties, much less pleasure and sexual sensitivity etc. etc. etc.
Scientific research says that rhodiola can increase blood serotonin levels by up to 30%.
My question is: does rhodiola also cause sexual problems due to increased serotonin?
David Tomen
July 21, 2021
Paolo, Rhodiola Rosea may increase physical levels of serotonin in your brain by stimulating serotonin neurons to produce more serotonin. It is not a receptor inhibitor like SSRIs.
Many users of this herb report improved libido and sexual performance when using Rhodiola Rosea.
Raffaele
July 13, 2021
Hi, David,
I am taking Rodiola Rosea (500 mg> 3% Rosanins – 1% Salidrosides) every day and, one Dopa Mucuna (Now Foods) capsule five times a week.
I read that rhodiola rosea must be taken one week yes and one week no, or two months yes and one month off …….. are you okay?
I would like to take rodiola rosea every day, without a break.
Take it 365 days a year, are there any contraindications?
If you don’t take breaks, is there a risk that it will no longer give benefits?
Or that you increase too much serotonin and decrease dopamine?
Hello and thanks.
Raffaele
David Tomen
July 13, 2021
Raffaele, there is no reason to cycle Rhodiola Rosea nor take a break using it if it works for you. The week you stop using Rhodiola Rosea you will not receive it’s benefit. That’s goes for any adaptogen or herb.
Raffaele
July 15, 2021
Hi David, yes, I have been taking it for three months and it works very well on me.
By addiction, I mean: benzodiazepine anxiolytics, taken for a year, give less and less benefits (few – very few or zero benefits) and you need to increase the dosage ……….
Does Rhodiola Also Cause Addiction?
Or if a subject takes it indefinitely, will the rhodiola continue to give benefits?
Even after 3 or more years?
David Tomen
July 21, 2021
Raffaele, Rhodiola Rosea raises inter-cellular and possibly extra-cellular levels of these neurotransmitters by inhibiting receptors. It does NOT increase the physical level of dopamine in your brain. To increase dopamine levels you need a precursor like L-Tyrosine or L-DOPA.
And no, you cannot get addicted to Rhodiola Rosea like you can with certain drugs. Nor can you become tolerant to it. This is an herb and not a drug.
Ivo
July 4, 2021
Hi David,
Do you think the combination of Rhodiola Rosea and Lion’s Mane is appropriate? The goal is to use the brain at its maximum yet safe levels.
David Tomen
July 4, 2021
Ivo, you can certainly use Rhodiola Rosea with Lion’s Mane. But what exactly are you trying to achieve? Both are very effective supplements. But do not cover every brain function.
Ivo
July 6, 2021
David, thank you for your fast reply.
I am trying to learn as much information as possible in the software development field. This includes a lot of problem-solving as well. My goal is to be capable of studying at my best (around 6 hours of active time measured with Pomodoro). That’s a lot of stress and sometimes I feel tired and like I don’t want to keep doing it. That’s the point where I need help from nootropics in order to keep going.
Last few weeks I get:
* Tyrosine 500/1000mg because it helps with dopamine levels and will give me some more motivation.
* Omega 3 – around 300 mg EPA and DHA
* Coffee
* Theanine 200 mg or just 1 green tea
I had a great experience with:
Lion’s mane and huperzine. Not in combination.
I heard great things about Rhodiola and I plan to try it after tyrosine.
My questions are:
1. What else I can include in my stack and at what time would be optimal to get it?
2. What will help Lion’s mane + Rhodiola stack to be even more effective?
David Tomen
July 6, 2021
Ivo, I suggest you read this page: https://nootropicsexpert.com/best-nootropics/ because that is the list of supplements that will get you to where you want to be. The only exceptions from that list that are not critical are Quercetin, Aniracetam, Vinpocetine, and Sulbutiamine. The stack will work amazingly well without those four supplements.
But dosage and timing for each is critically important for the rest of them. For example, L-Tyrosine 500 mg 2 or 3-times per day. That means morning, noon and late afternoon. It’s that kind of thing that will keep you going for 6 hours of intense work. Not alone of course but it’s just one part of the stack you need.
The Omega-3 that you are using is not very effective because your brain is about 60% fat. And most of that ‘fat’ is DHA. You need minimum 1,000 mg DHA per day.
Tobiasz
May 22, 2021
Hi. If I have Jarrows Adrenal Optimizer and there is 100mg of Rhodiola extract without visible standarization and taking it twice with other adaptogens (in their formula), is it safe to assume that I’m hiting your suggested dose and getting all the benefits that apply to chronic stress condition?
David Tomen
May 22, 2021
Tobiasz, if the Rhodiola Rosea they use is not standardized then it is unlikely.
Marek Šedina
May 10, 2021
Hi David, can i take rhodiola from mind lab pro twice per day and preworkout? I am not asking about if its safe but from the perspective of ratio of the active compounds. Rhodiola from mind lab pro has 3 percent rosavin 1 percent salidroside but thodiola for workout purposes has pretty much always 4 percent rosavin. So my question is if that 4 percent rhodiola can cancel out some of the benefits of the 3-1 ratio if used at the same day. My guess was that it could disrupt balance of compounds from rhodiola you want to have for the cognitive outcome you desire if you use both? But thats why i am asking you if thats even possible and true? Thank you.
David Tomen
May 10, 2021
Marek, not a worry. The reason I recommend a 3:1 ratio of rosavins and salidrosides is because it mimics the ratio of these compounds naturally occurring in the Rhodiola Rosea root.
Rosavins and salidrosides seem to work in synergy. While clinical studies show rosavins more effective at higher doses and salidrosides effective at lower doses (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5976749/).
The Rhodiola you describe was either extracted for just rosavins. Or more than likely it’s not Rhodiola Rosea at all but another of the 60 – 90 species of Rhodiola.
Gabriel
May 5, 2021
Hello hello, can I take Rhodiola and L-Theanine at the same time?
David Tomen
May 5, 2021
Gabriel, yes you can. Mind Lab Pro even combines them in their formula. https://www.mindlabpro.com/
Emma
April 26, 2021
Hi David,
Could you please help me and advise if this product is ok to take? I just bought it and scared that it may be a high dose so only took a 3rd this product is all we can access in Australia and was so expensive $50 for 50.
Each tablet contains: Rhodiola rosea (Arctic root) extract equiv. to dry root………….…1.5g (1500mg) Standardised to Rosavins 15mg Standardised to Rosavin 7.5mg Standardised to Salidrosides 3.75mg
Thanks
David Tomen
April 27, 2021
Emma, it should be safe but it depends on how your system reacts to it. Scroll back up to the “Side Effects” section on this page. And if you experience any of the symptoms described in the 2nd paragraph you will know that you are using too much.
Emma
April 29, 2021
Hi David . Thanks so much . I contacted the company and they advised The product contains Rhodiola rosea concentrated extract of 375mg which is derived from a minimum dry root of 1.5g (1500mg). The product is then standardised to the active constituents of Salidrosides 3.75mg and Rosavin 7.5mg which is equivalent to total Rosavins of 15mg.
The standardisation of herbal extracts ensures the quality of ingredients along with ensuring a therapeutic dose in every tablet (the levels of active ingredients found naturally in herbs can fluctuate due to various reasons, for example the conditions in which they are grown or the season in which the herb was harvested. By standardising our herbal extracts, we can guarantee that you are getting an effective dose of the active constituent). Although the dose may seem high, it has been based on scientific evidence and clinical trials which include parameters of both efficacy and safety. Additionally, all of our products have been regulated and approved by the Therapeutic Goods Administration (TGA) which is the Australian standard in meeting all requirements for complimentary medicines. The TGA requires that we include the amount of the whole herb used as starting material on the label. The ratio of whole herb extract in the Rhodiola is 4:1. Therefore, our labelled dosage of 1500mg actually yields 375mg of the extract – the same dosage used in clinical trials and within the therapeutic dose range. This does tend to cause a little confusion sometimes with regards to how the label looks, however, we must comply with TGA requirements . Thanks