NOW Foods Magnesium Glycinate Review — Health & Vitality Daily

NOW Foods Magnesium Glycinate product photo — NOW Foods Magnesium Glycinate, as sold by the manufacturer.

What it's marketed for

NOW Foods markets this supplement using standard structure/function language: support for "healthy muscle, nerve and heart functions." That's a legal category of claim under U.S. supplement rules — it describes how a nutrient normally functions in the body, not a promise to treat or cure anything. We didn't find the company overreaching beyond that framing on its own packaging or product page.

What we found

The label lists 2,000mg of magnesium bisglycinate (magnesium chelated to the amino acid glycine) per two-tablet serving. That 2,000mg number is the weight of the whole compound, not the amount of usable magnesium your body actually absorbs — the figure that matters for intake is the elemental magnesium amount, which NOW Foods discloses clearly on the same panel as 200mg, or 48% of the Daily Value. We'd flag any magnesium product that only prints the compound weight and leaves you to guess the elemental dose; this one doesn't do that.

On manufacturing, NOW Foods holds an NPA A-rated GMP certification and runs its own in-house ISO/IEC-accredited testing labs. That's a real, verifiable facility-level credential covering how the plant is run and tested. It is not the same thing as a product-level seal like NSF Certified for Sport or USP Verified, which test and certify an individual finished product batch by batch. We could not confirm either of those product-level seals for this specific SKU, so we're not implying one here — the facility certification and a third-party product seal are different claims, and only the first is present on this bottle.

Worth knowing: People taking loop or thiazide diuretics should know these medications deplete magnesium over time, which can change how much supplementation makes sense — worth a doctor's input either way. Anyone with kidney disease should ask a doctor before starting, since impaired kidneys can't clear excess magnesium as efficiently. And because large magnesium doses can interfere with the absorption of certain antibiotics and osteoporosis medications if taken at the same time, spacing doses a few hours apart from those medications is the safer approach.

The label, in more detail

NOW Foods is a family-owned manufacturer founded in 1968 by Elwood Richard, headquartered in Bloomingdale, Illinois. It's grown into a company with more than 1,500 employees distributing to over 60 countries, but it's still framed by the family as a family-run operation rather than a venture-backed startup. That longevity is relevant context for a supplement brand — it means decades of manufacturing history and regulatory scrutiny to look back on, though it isn't a substitute for reading the actual label in front of you, which is what we did above.

For context on how 200mg elemental magnesium fits into a full day, the NIH Office of Dietary Supplements sets the RDA at roughly 400–420mg per day for adult men and 310–320mg per day for adult women, counting magnesium from all sources — food included, not just supplements. This product's 200mg serving is meant to supplement, not fully replace, dietary intake.

Where to buy it

We're comfortable linking to this one because the elemental dose is disclosed plainly and the facility certification is real and verifiable — nothing on the label is overstating what's actually being sold.

See it on Amazon →

As an Amazon Associate, Health & Vitality Daily earns from qualifying purchases. This link opens a live Amazon search for this exact product, not one specific listing we control — prices and sellers may vary.

Common questions

Is 200mg of elemental magnesium a full daily dose?: No — it's 48% of the Daily Value, meant to supplement magnesium you're already getting from food, not to be your only source.
Does the NPA A-rated GMP certification mean this exact bottle was independently tested?: It certifies how the manufacturing facility operates and tests, including in-house ISO/IEC-accredited labs. It is not the same as a product-specific third-party seal like NSF Certified for Sport or USP Verified, and we didn't find either of those for this SKU.
Why glycinate instead of a cheaper form like magnesium oxide?: Chelated forms like magnesium bisglycinate are generally considered gentler on digestion and better absorbed than magnesium oxide, though individual tolerance varies.

These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Talk to a healthcare provider before starting this or any supplement, especially if you take prescription medication or manage an existing health condition.

Sources

NIH Office of Dietary Supplements, Magnesium Fact Sheet for Health Professionals
NOW Foods, company history and manufacturer product page