Last updated: October 2026
Ashwagandha has more trial evidence for stress: a 2022 review of 12 trials found it lowered stress and anxiety scores, though the evidence was rated low certainty. Magnesium is better for filling a dietary gap and has authorised claims for tiredness and psychological function. Magnesium is the safer everyday choice; ashwagandha is under FSA safety review.
Below: a side-by-side comparison, what each is best for, safety, taking them together, and how to choose.
Ashwagandha vs magnesium at a glance
| Ashwagandha | Magnesium | |
|---|---|---|
| What it is | A herb (root extract) | An essential mineral |
| Stress and anxiety evidence | 12 trials, positive but low certainty | Mixed, low quality; best in people with low intake |
| Sleep evidence | Small benefit in a review of 5 trials | People fell asleep about 17 minutes faster in a small review |
| Authorised health claims | None | Tiredness and fatigue, psychological function, nervous system, muscles |
| UK safety position | Under FSA review; some groups should avoid | Up to 400mg a day from supplements unlikely to cause harm |
| Typical trial dose | 300 to 600mg extract a day | 200 to 400mg a day |
| How long to try | 8 weeks | 4 to 6 weeks |
Ashwagandha: what the research shows
A 2022 review of 12 trials with about 1,000 people found ashwagandha reduced stress and anxiety scores compared with placebo, with the clearest effect for stress at 300 to 600mg a day. The authors rated the certainty as low, as many trials were small and results varied. A 2021 review also found a small improvement in sleep. See what ashwagandha does and when to take ashwagandha.
Magnesium: what the research shows
A 2017 review of 18 studies found hints that magnesium helps people prone to anxiety, but rated the evidence as poor quality. It’s most likely to help if your diet is low in magnesium. Magnesium contributes to the reduction of tiredness and fatigue, normal psychological function and normal functioning of the nervous system. See magnesium for anxiety and magnesium for sleep.
Which should you choose?
| If you… | Consider |
|---|---|
| Want the safest everyday option | Magnesium |
| Feel tired and eat few nuts, seeds or greens | Magnesium |
| Want an evening wind-down routine | Magnesium glycinate |
| Feel under ongoing pressure and are a healthy adult not on medication | Ashwagandha may be worth discussing with a pharmacist |
| Are pregnant, breastfeeding, or have liver or thyroid problems | Avoid ashwagandha |
Neither is a treatment for anxiety disorders. If anxiety is affecting your life, speak to your GP about talking therapies. See natural supplements for anxiety and ashwagandha vs rhodiola.
Can you take them together?
There’s no known interaction between magnesium and ashwagandha, and some people take magnesium in the evening and ashwagandha earlier in the day. Start one at a time, two to four weeks apart, so you know what’s helping, and check with a pharmacist if you take any medicines.
Safety
- Ashwagandha: the FSA’s safety advisers are reviewing reports of liver, thyroid and blood sugar effects. Avoid it if pregnant, breastfeeding, under 18, or if you have liver or thyroid problems, and check with a pharmacist if you take thyroid, diabetes, blood pressure, sedative or immune-suppressing medicines. Read our ashwagandha UK safety review.
- Magnesium: loose stools at high doses; avoid supplements with kidney disease unless advised; separate from some antibiotics and osteoporosis medicines.
We don’t recommend our products during pregnancy or breastfeeding.
Our products
Our Magnesium Glycinate Sleep Complex combines bisglycinate and citrate with glycine, L-theanine and botanicals, giving 148mg of magnesium per serving as an evening drink. Our Flow CBD Oil combines broad spectrum CBD with ashwagandha root and maca for daytime use. The FSA’s 10mg a day figure for CBD is precautionary advice rather than a legal limit, set while longer-term safety research continues. At Evopure we think it is a very cautious figure, and many adults use more. If you go above it, increase slowly, and check with your GP or pharmacist first if you take any medication.
FAQs
Is ashwagandha or magnesium better for stress?
Ashwagandha has more trials for stress, though low certainty. Magnesium is safer for everyday use and helps most if your intake is low.
Is ashwagandha or magnesium better for sleep?
Both have small, low-quality evidence. Magnesium glycinate is the gentler, safer evening choice for most people.
Can I take ashwagandha and magnesium together?
There’s no known interaction. Start one at a time and check with a pharmacist if you take medicines.
Is ashwagandha safe?
Many healthy adults tolerate it, but the FSA is reviewing its safety, and some groups should avoid it, including pregnant women and people with liver or thyroid problems.
How long do ashwagandha and magnesium take to work?
Ashwagandha trials usually ran for about 8 weeks; give magnesium 4 to 6 weeks.
Sources
- Akhgarjand C et al. Does ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta-analysis. Phytother Res, 2022.
- Cheah KL et al. Effect of ashwagandha extract on sleep: a systematic review and meta-analysis. PLoS One, 2021.
- Boyle NB et al. The effects of magnesium supplementation on subjective anxiety and stress. Nutrients, 2017.
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults. BMC Complement Med Ther, 2021.
- FSA. Summary of responses to call for evidence on ashwagandha, 2026.
