Magnesium glycinate and ashwagandha: what the evidence says about taking them together

Nobody has tested magnesium and ashwagandha together in a trial — what's known about each comes from separate studies, at different doses, in different people. Ashwagandha has its own reasonably consistent trial base for stress; magnesium's evidence for stress and anxiety is thinner and mixed. Combining them is a reasonable guess, not a tested combination.

What the evidence doesn't support

It doesn't support a claim that magnesium and ashwagandha work better together than either alone — that comparison has never been run. It doesn't support treating either ingredient as a treatment for anxiety, panic disorder or any stress-related diagnosis. And it doesn't support assuming ashwagandha's dose-response data tells you anything about what a typical magnesium serving would add, since the two ingredients have entirely separate literatures.

What the trials found

Ashwagandha's evidence is the more consistent of the two. A 2012 randomized, double-blind, placebo-controlled trial gave 64 adults with a history of chronic stress 600 mg/day (300 mg twice daily) of a high-concentration, full-spectrum ashwagandha root extract for 60 days. The treatment group had significantly lower scores on stress-assessment scales and significantly lower serum cortisol than placebo by day 60. A 2024 meta-analysis pooling nine randomized trials, 558 people total, found ashwagandha outperformed placebo on the Perceived Stress Scale, the Hamilton Anxiety Scale, and serum cortisol. Doses varied across those nine trials rather than converging on one number.

Magnesium's evidence is weaker and mixed by comparison. A 2017 systematic review of 18 studies on magnesium and subjective anxiety found benefit in roughly half of them, and every one of those studies recruited people already vulnerable to anxiety — mild anxiety, premenstrual syndrome, postpartum status, or hypertension — never a general population. Not one of the 18 studies used a validated stress measure. A separate 2018 randomized trial of magnesium for stress, discussed on our stress page, had no placebo arm at all.

Neither ingredient's trials used magnesium glycinate specifically or the branded ashwagandha extracts stacked together, and no study has measured the two given at the same time. That means there's no dose-matched evidence for a combined product, whatever the individual literatures suggest on their own.

It's worth noting why these two ingredients get paired in marketing in the first place: both are sold on a general "calm" positioning, and both have at least some human trial data, which is more than a lot of ingredients in that category can say. That's a reasonable commercial logic. It isn't the same thing as a trial showing an added or multiplied effect from taking them together, which — again — doesn't exist.

Ingredient	Best evidence	Population	Dose in that trial
Ashwagandha	600 mg/day lowered stress scores and cortisol vs placebo (n=64)	Adults with chronic stress	300 mg twice daily, 60 days
Magnesium	Mixed; benefit in about half of 18 studies	Anxiety-vulnerable samples only	Varied, not standardized
Both together	No trial exists	—	—

Questions people ask

Can you take magnesium glycinate and ashwagandha together?

There's no trial of the combination, so there's no evidence describing what taking them together does that either doesn't already, on its own. Whether that's fine to do is a separate safety question worth raising with a doctor or pharmacist, especially given any medications or conditions involved.

Does ashwagandha work better with magnesium?

That specific comparison hasn't been tested. Ashwagandha's own trials, described above, didn't include a magnesium arm or a combination arm.

Should I take ashwagandha instead of magnesium glycinate for stress?

The two ingredients have different, separately studied literatures, and this page doesn't rank one against the other. Ashwagandha's stress trials are more consistent than magnesium's; that's a description of the evidence base, not a recommendation to substitute one supplement for the other or for medical care.

Is ashwagandha safe to take with other supplements?

Ashwagandha has documented interactions and cautions of its own — including with thyroid medication and in pregnancy — that are outside what this page covers. A pharmacist or doctor is the right source for a full interaction check against anything else you take.

How much ashwagandha and magnesium glycinate should I take together?

There's no studied combined dose. The 600 mg/day figure above comes from ashwagandha trials that didn't include magnesium at all, and magnesium's own trials didn't include ashwagandha, so neither number was established with the other ingredient present.

When to talk to a doctor

Chronic stress or anxiety that affects daily life is worth bringing to a doctor. Neither magnesium nor ashwagandha is a treatment for anxiety, panic disorder or a stress-related diagnosis, and nothing in the evidence above supports using either, alone or combined, as a substitute for medical evaluation. Ashwagandha in particular should be discussed with a doctor if you're pregnant or nursing, have a thyroid condition, or take other medication.

Related reading: does magnesium glycinate help with anxiety?, magnesium and stress, and magnesium glycinate and L-theanine.