Best Natural Stress Supplements in Australia: Ingredients and Doses Compared
The natural stress ingredient with the most human research behind it is ashwagandha root extract, most often studied as KSM-66 at 600 mg a day. Saffron extract has been tested in two Australian trials, including one led by researchers in Queensland. Lemon balm and reishi bring long traditional use, with human studies of their own. The best way to compare products in Australia is to check whether each ingredient is a named extract, whether the dose per day matches the dose that was studied, and whether the product is an AUST L listed medicine.
I have developed more than 250 supplement formulations, and the gap I see most often is not the ingredient list, it is the dose. This guide puts the study doses next to each other, including for our own formula, so you can check a label in under a minute. It is a buying guide built on published research, not a health claim.
In this article
How to compare a stress supplement label
Four quick checks tell you whether a product lines up with the research.
- Look for a named extract. Trials test a specific extract, not just a plant. KSM-66, for example, is a root only ashwagandha extract standardised to at least 5 per cent withanolides. A label that only says "ashwagandha" does not tell you which one you are getting.
- Compare the extract amount, not the plant amount. Australian labels often show two numbers, such as "extract 300 mg, from 3.75 g dry root". The first number is the extract, and that is the one to compare with the research.
- Work out the daily amount. Most labels list amounts per capsule. Multiply by the number of capsules in the directions. Two capsules of 300 mg is 600 mg a day.
- Check for an AUST L number. It means the product is entered on the Australian Register of Therapeutic Goods, and you can look up its ingredients and quantities. For the full walkthrough, see how to read a supplement label.
Ingredients and study doses compared
These are the doses used in the human studies, with who was studied. Every study is listed in the sources at the end.
| Ingredient | Dose used in studies | Who was studied | What was measured |
|---|---|---|---|
| Ashwagandha root extract (KSM-66) | 600 mg a day (300 mg twice daily); 250 mg also tested | Adults with high perceived stress, 8 weeks to 60 days | Perceived stress scores and serum cortisol |
| Saffron stigma extract | 28 mg a day, 4 to 12 weeks | Australian adults reporting low mood, in two trials | Mood, plus stress and anxiety symptom scores |
| Lemon balm extract | 300 mg or 600 mg, single dose | Healthy volunteers during a laboratory stress test | Mood and mental processing under stress |
| Reishi polysaccharide extract | 5.4 g a day for 8 weeks | 132 adults experiencing ongoing fatigue | Overall improvement, fatigue and sense of wellbeing |
Ashwagandha (KSM-66)
Ashwagandha has been used in Ayurvedic medicine for centuries, and it now has the deepest modern trial record of the stress herbs. The most quoted trial is a randomised, double blind, placebo controlled study in the Indian Journal of Psychological Medicine. Sixty four adults aged 18 to 54 with high perceived stress took 300 mg of KSM-66 twice a day, 600 mg in total, for 60 days.
After 60 days on 600 mg a day of KSM-66, perceived stress scores fell 44 per cent against 5.5 per cent on placebo, and serum cortisol fell 27.9 per cent against 7.9 per cent.
A later trial published in Cureus compared two doses of the same extract in 60 stressed but healthy adults over eight weeks. Both 250 mg and 600 mg a day reduced perceived stress more than placebo, and the 600 mg group had the larger change in cortisol. Both trials were supported by the extract supplier, which is common in herbal research, and the dose that shows up most consistently is 600 mg a day of root extract. That is the number to check a label against.
Saffron and the Australian trials
Saffron comes from the stigma of the Crocus sativus flower, and it has a long history in Western and Persian herbal medicine for supporting emotional balance. Much of the modern research on it has been done in Australia.
In a placebo controlled trial published in Complementary Therapies in Medicine, led by researchers at the University of Southern Queensland and in Brisbane, 128 healthy adults reporting low mood took a standardised saffron extract or a placebo for four weeks. The 28 mg daily dose reduced negative mood and symptoms related to stress and anxiety compared with placebo.
A 2025 trial in the Journal of Nutrition, also run in Australia and described by its authors as the largest saffron study to date, gave 202 adults with low mood 28 mg a day or a placebo for 12 weeks. The authors concluded that it supports a benefit for mood over three months, while noting a large placebo response. For an Australian brand, it is good to see an ingredient tested in people who live and work much like our customers do.
Lemon balm
Lemon balm is a member of the mint family, traditionally used in Western herbal medicine to relieve symptoms of mild anxiety and stress. The best known study is a crossover trial in Psychosomatic Medicine. Eighteen healthy volunteers took single doses of 300 mg and 600 mg of a standardised extract before a 20 minute laboratory stress test. The 600 mg dose reduced the negative mood effects of the test, and the 300 mg dose improved the speed of maths processing without any loss of accuracy. Lemon balm also has a long safety record in traditional use.
Reishi mushroom
Reishi (Ganoderma lucidum) is one of the most valued mushrooms in traditional Chinese medicine, where it has long been used to calm the mind and support general wellbeing. In stress formulas it is used as an adaptogen alongside herbs like ashwagandha.
In a randomised, double blind, placebo controlled trial in the Journal of Medicinal Food, 132 adults experiencing ongoing fatigue took a reishi polysaccharide extract, 5.4 g a day, or a placebo for eight weeks. Overall, 51.6 per cent of the reishi group were rated as more than minimally improved, compared with 24.6 per cent on placebo, and the extract was well tolerated. That trial used a concentrated polysaccharide preparation at a higher dose than a typical capsule, so it is best read as background on why reishi is valued for wellbeing.
Other ingredients you will see
L-theanine is an amino acid found in tea. It was tested at 200 mg a day for four weeks in a small crossover trial in Nutrients in 30 healthy adults, and is usually sold on its own or in sleep and calm blends.
Magnesium is an essential mineral involved in normal nerve and muscle function, and it often appears in stress and sleep products. If you take magnesium, the form and the elemental dose matter more than the word on the front of the pack. We cover that in our magnesium buyer's guide.
Where Ritua Stress sits
Here is how our own formula compares. Ritua Stress is an AUST L listed medicine (AUST L 419294), and its ingredients are recorded on the Australian Register of Therapeutic Goods. The label lists amounts per capsule, and the directions are two capsules once daily with food, so the daily amounts below are double the per capsule amounts.
| Ingredient | Per capsule | Per day (2 capsules) | How it compares |
|---|---|---|---|
| KSM-66 Ashwagandha root extract, from 3.75 g dry root per capsule | 300 mg | 600 mg | Matches the 600 mg a day used in the KSM-66 trials |
| Reishi mushroom extract, from 3 g dry fruiting body per capsule | 300 mg | 600 mg | From 6 g of dried reishi a day, included as an adaptogen for traditional use |
| Lemon balm leaf extract, from 1.5 g dry leaf per capsule | 150 mg | 300 mg | Matches the 300 mg dose tested in the laboratory stress trial |
| Saffron stigma extract, from 15 mg dry stigma per capsule | 5 mg | 10 mg | A supporting ingredient for emotional balance; the Australian trials used 28 mg |
Ritua Stress is built around KSM-66 at the full 600 mg daily dose used in the trials, with lemon balm at the dose tested under laboratory stress, and reishi and saffron alongside for their traditional roles in calm and emotional balance.
It is important to be clear about what the studies above are and are not. They tested individual extracts, not Ritua Stress, and they are not the basis of its listing. Ritua Stress is traditionally used in Ayurvedic medicine to help the body adapt to stress, and traditionally used in Western herbal medicine to relieve symptoms of stress and mild anxiety and to support healthy emotional balance.
Label information
Ritua Stress, AUST L 419294. Always read the label and follow the directions for use. If symptoms persist, talk to your health professional. Not recommended for pregnant or lactating women.
A checklist for the shelf
| What to check | What good looks like |
|---|---|
| Extract | A named, standardised extract such as KSM-66, not just the plant name |
| Dose per day | Extract milligrams per day that match the studied dose, after multiplying out the capsules |
| Where it was studied | Research that includes Australian participants is a plus |
| Blends | Every ingredient has its own amount; no proprietary blend hiding the numbers |
| ARTG status | An AUST L number you can look up on the register |
| Warnings | Pregnancy and interaction advice printed clearly |
The bottom line
If you are comparing natural stress supplements in Australia, start with ashwagandha. A named root extract such as KSM-66 at around 600 mg a day is the dose with the most human research. Saffron has been studied in Australian adults at 28 mg a day, lemon balm has been tested under laboratory stress at 300 to 600 mg, and reishi brings centuries of traditional use with a clinical trial of its own.
The most useful habit is to do the maths on the label: extract milligrams, per day, against the study dose. Most of the difference between two products that look the same on the front is in that number.
If you want to apply that checklist to ours, the full formula is on the Ritua Stress product page, and there is a 7 day trial pack if you would rather start small. For the biology behind the stress response itself, see understanding cortisol's role in stress. For the evening side of the same question, see natural sleep ingredients and doses compared, and for the daytime side, nootropic ingredients and doses compared.
This article is general information, not medical advice, and is not a substitute for guidance from your doctor, particularly if you are managing an existing health condition, are pregnant or breastfeeding, or are taking medication. Herbal extracts can interact with some medicines, so check with your doctor or pharmacist first if you take any regularly.
Jasmine Meagher
BSc Food Science and Nutrition · Founder, Ritua
Jasmine founded Ritua to bring evidence-based, TGA-compliant supplements to Australian women. She writes about the research behind every ingredient Ritua sells.
Frequently asked questions
What is the most researched natural ingredient for stress?
Ashwagandha root extract has the most placebo controlled human trials, most of them using the KSM-66 extract. The dose used most consistently is 600 mg a day, taken as 300 mg twice daily, over 8 weeks to 60 days.
Has saffron been studied in Australia?
Yes. A four week trial led by researchers at the University of Southern Queensland and in Brisbane found 28 mg a day of a standardised saffron extract reduced negative mood and stress related symptoms in healthy adults. A larger 12 week Australian trial in 2025 also used 28 mg a day.
What does "derived from dry root 3.75 g" mean on a label?
It is the amount of raw herb used to make the extract in each capsule. The extract amount, for example 300 mg, is the number that trials report, so use that one when comparing products against the research.
What is reishi traditionally used for?
Reishi has a long history in traditional Chinese medicine to calm the mind and support general wellbeing, and it is used as an adaptogen in stress formulas. A placebo controlled trial of a concentrated reishi extract found more people rated as improved than on placebo after eight weeks.
What is in Ritua Stress?
Each capsule contains KSM-66 Ashwagandha extract 300 mg, reishi mushroom extract 300 mg, lemon balm extract 150 mg and saffron extract 5 mg. The daily serve is two capsules, so 600 mg of KSM-66 a day.
How do I check whether a supplement is AUST L listed?
Find the AUST L number on the pack and search it on the TGA's Australian Register of Therapeutic Goods. The public summary lists the ingredients, quantities per capsule, permitted indications and required warnings. A listing means the product is entered on the register; it does not mean the TGA has evaluated whether it works.
Sources
- A prospective, randomized double blind, placebo controlled study of safety and efficacy of a high concentration full spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine, 2012.
- Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double blind, randomized, placebo controlled clinical study. Cureus, 2019.
- Randomised, placebo controlled trial of a standardised saffron extract on mood in healthy adults over 4 weeks. Complementary Therapies in Medicine, 2017.
- Randomised, placebo controlled trial of a saffron extract on mood and general wellbeing in adults experiencing low mood. Journal of Nutrition, 2025.
- Attenuation of laboratory induced stress in humans after acute administration of Melissa officinalis (lemon balm). Psychosomatic Medicine, 2004.
- Randomised, double blind, placebo controlled trial of a reishi (Ganoderma lucidum) polysaccharide extract over 8 weeks. Journal of Medicinal Food, 2005.
- Effects of L-theanine administration on stress related symptoms and cognitive functions in healthy adults: a randomized controlled trial. Nutrients, 2019.
- ARTG entry 419294 (Stress). Therapeutic Goods Administration.
- AUST L and AUST R numbers on medicine labels. Therapeutic Goods Administration.