My Supplement Boost · Daily Essentials
Magnesium Glycinate
The honest version: the real doses, the evidence graded for what it’s worth, and who should skip this one.
Magnesium Glycinate · 90 capsules · 30 days
The essential mineral half of us fall short on — in the form that’s easiest to keep taking.
Magnesium is a required cofactor in more than 300 processes in the body, and roughly half of Americans get less than they need from food. Glycinate is the form that delivers it without the laxative effect the cheap versions are known for — which is exactly why it’s the one people actually stick with. Below: the real doses, what the research supports, what it doesn’t, and who should skip it.
Everything on the label
What's actually in it.
Three capsules give you 275 mg of elemental magnesium — 65% of the Daily Value — from 2,500 mg of magnesium glycinate. That gap between the two numbers is normal and worth understanding: glycinate is magnesium bound to the amino acid glycine, so most of the weight on the label is the carrier, not the mineral. Any brand printing only the bigger number is hoping you won't notice.
Unlike our creatine, this one isn't a single ingredient. Four other things are in the capsule, and we'd rather explain them than let you look them up.
- Hypromellose
- The capsule shell itself. Plant-derived, which is why this is vegan — most capsules are beef or pork gelatin.
- Magnesium stearate
- A flow agent. Keeps powder from sticking to the machinery during filling. It's a magnesium salt of a fatty acid, present in trace amounts.
- Silicon dioxide
- Anti-caking. Stops the powder clumping so each capsule holds the same dose.
- Rice flour
- Filler. Takes up the remaining volume so the capsule fills consistently.
Made in the USA in an FDA-registered facility.
* Percent Daily Values are based on a 2,000 calorie diet.
Other Ingredients: Hypromellose (capsule), Magnesium Stearate, Silicon Dioxide, Rice Flour.
The evidence
What the research actually shows.
We grade our own products. Where the evidence is strong we say so plainly. Where it's early, we say that too — including when it costs us the sale.
Magnesium is genuinely essential
This isn't a botanical with a hopeful story attached. Magnesium is a required mineral acting as a cofactor in more than 300 enzyme systems — protein synthesis, muscle and nerve function, blood glucose control, blood pressure regulation, energy production and bone structure. Your body cannot run without it. That much is settled biochemistry, not a marketing claim.
Most Americans don't get enough
Roughly 48% of Americans consume less magnesium than the Estimated Average Requirement, according to the NIH Office of Dietary Supplements — with older men and adolescents at highest risk. Adult women need 310–320 mg a day and adult men 400–420 mg. That shortfall, not any dramatic effect, is the honest reason to consider supplementing.
Sleep quality — and this is the one to read
Sleep is why most people buy magnesium, so here's the actual state of it. The most-cited meta-analysis pooled three trials totalling 151 older adults. It found people fell asleep about 17 minutes sooner, while total sleep time did not reach significance. The authors rated the evidence low to very low certainty and wrote plainly that the literature is substandard for physicians to make well-informed recommendations.
Blood pressure and blood sugar
Magnesium has a recognised role in both blood pressure regulation and glucose control. In trials, supplementation produces only marginal blood pressure changes — on the order of 2–3 mmHg. Observational studies link higher magnesium intake with better glucose measures, but clinical trials conflict, and the American Diabetes Association does not find the evidence sufficient to recommend routine supplementation.
Most people buy magnesium for sleep. We're going to be the ones who tell you that's the weakest evidence on this page.
Our standard
How to take it
Three capsules. Once a day.
With food
Magnesium is better tolerated with a meal. Any meal — there's no magic window.
Evening, if you like
Plenty of people take it before bed. That's preference and routine, not a dosing requirement.
One bottle is exactly 30 days at the labelled serving. No loading phase, no cycling, nothing to time.
You may already be getting enough. Magnesium is in leafy greens, nuts, seeds, beans and whole grains. If you eat a good amount of those, a supplement is topping up a tank that isn't low — and the honest answer is you may not notice anything. The people most likely to benefit are those eating few of those foods, older adults, and anyone whose doctor has flagged low magnesium. We'd rather say that than sell you a bottle on a maybe.
Before you buy
Who should skip this one.
Anyone with kidney disease should not take supplemental magnesium without their doctor. Healthy kidneys clear excess magnesium; impaired ones don't, and it can build up. This is the most important line on the page.
Magnesium also interacts with common medications:
- Antibiotics — tetracyclines and quinolones. Magnesium binds them and reduces absorption; separate the doses.
- Bisphosphonates — the osteoporosis medications. Same binding problem.
- Proton pump inhibitors — long-term use can lower magnesium levels, which is a reason to talk to your doctor rather than self-manage.
- Diuretics — some increase magnesium loss, others reduce it.
Also skip if you're pregnant or nursing, or under 18, without medical advice. Too much supplemental magnesium causes diarrhoea and cramping — that's the body's way of dumping the excess, and it's why the 350 mg supplemental limit exists.
Straight answers
Magnesium questions, answered.
Why does the label say 2,500 mg and 275 mg?
275 mg is the actual magnesium. 2,500 mg is the weight of the full magnesium glycinate compound, most of which is the glycine carrier. Both numbers are honest; only one is the dose. Brands that lead with the big number are counting on you not knowing the difference.
Is glycinate really better than the cheap stuff?
The NIH notes that forms which dissolve well are more completely absorbed than oxide and sulfate. The clearer, more practical difference is tolerance: oxide and citrate are the forms known for a laxative effect. Glycinate is the one people choose when that's a problem.
Will it make me sleepy?
It isn't a sedative and we won't sell it as one. Some people find it settling in the evening; others notice nothing. See the evidence section above for exactly how thin the sleep research is.
How long before I notice something?
If you're genuinely low, correcting it takes weeks, not days. If you weren't low, you may not notice a change at all — and that isn't a defective product, it's what topping up a full tank looks like.
Can I take it with my other supplements?
Generally yes. The interactions that matter are with prescription medications, listed above — not with other supplements. Keep total supplemental magnesium under 350 mg a day across everything you take.
Three capsules feels like a lot.
It is, and it's a consequence of the form. Glycinate is bulky — 2,500 mg of compound won't fit in one capsule. A single-capsule magnesium is almost always oxide, which is cheaper, smaller and worse absorbed.
Our standard
Why we stock it.
An essential mineral that roughly half the country under-consumes, in the form that's easiest to keep taking.
We're not going to tell you it fixes your sleep. We're going to tell you what it is, what's in the capsule, what the research supports and what it doesn't, and let you decide. That's the whole business.
Sources. Magnesium — Health Professional Fact Sheet, NIH Office of Dietary Supplements. · Mah J, Pitre T., Oral magnesium supplementation for insomnia in older adults: a systematic review & meta-analysis, BMC Complement Med Ther 2021.