The Best Magnesium Glycinate Supplements in 2026 [Full Comparison]

Quick takeaway: 

Not all magnesium glycinate supplements are formulated the same way. The most important things to look for are whether the form is pure bisglycinate, what other ingredients are in the tablet or capsule, and how much elemental magnesium you actually get per serving. Price comparisons only make sense per serving — not per bottle.

Here's how the five most-searched products actually compare.

You've done the research. You know magnesium glycinate is a well-absorbed form, you know to look for elemental magnesium in the supplement facts panel, and you've got a shortlist. Now you want to know which one is actually worth buying.

The honest answer is that several of them are — for different reasons. Thorne and Pure Encapsulations have decades of institutional credibility behind them. Metagenics is the number one doctor-recommended brand with 40 years in the practitioner channel. Sports Research is a widely available consumer brand with a distinctive liquid softgel format. Pure Powder Nutrition sits in a different position: practitioner-grade ingredients at Amazon-direct pricing, with GMP-certified manufacturing and third-party testing.

What separates them comes down to three things: the exact form of magnesium used, what else is in the capsule or softgel, and what that costs you per serving. We compared all five on those terms.

Comparison at a glance

Prices sourced from brand websites and authorised retailers. Always verify the current listing before purchasing.

About the Five Brands

Pure Powder Nutrition 100% Magnesium Glycinate

$19.90 — available exclusively on Amazon

Pure Powder Nutrition's magnesium glycinate uses non-buffered bisglycinate — the only form in the capsule, with no magnesium oxide blended in. Each capsule delivers 100 mg elemental magnesium. The other ingredients list is limited to the capsule shell. No fillers, binders, or flow agents. Manufactured in a GMP-certified facility in Texas, USA.

What it does well: Pure non-buffered bisglycinate, GMP-certified and third-party tested, vegan capsule shell only — no other ingredients. Clean formulation at an accessible price point.

Worth knowing: Pure Powder Nutrition is a newer brand than the others in this comparison. 

Thorne Magnesium Glycinate

$26.00 for 90 capsules

Thorne is among the most trusted supplement brands in the practitioner and professional sports space — third-party certified, used by 100+ professional sports organisations, and consistently recommended by health-care practitioners. Their magnesium glycinate capsule delivers 120 mg elemental per capsule as bisglycinate. The other ingredients list is short: hypromellose capsule and leucine. Two capsules reach 200 mg daily at approximately $0.58 per day.

What it does well: Rigorous third-party certification, NSF-certified, practitioner-endorsed, genuine bisglycinate in a short-formula capsule.

Worth knowing: Higher cost per serving than PPN and Sports Research. The price partly reflects brand positioning and institutional endorsement.

Pure Encapsulations Magnesium Glycinate

$27.00 for 90 capsules

Pure Encapsulations has 30 years of hypoallergenic formulation behind it. Their magnesium glycinate capsule has the shortest other-ingredients list in this comparison — vegetarian capsule and ascorbyl palmitate only. For people managing multiple food sensitivities or who need to avoid common excipients, this formulation approach matters considerably. Each capsule delivers 120 mg elemental.

What it does well: Two other ingredients only — the cleanest excipient profile in this comparison, thirty-year hypoallergenic track record, third-party tested.

Worth knowing: Higher cost per serving than PPN and Sports Research. Primarily a practitioner-channel product.

Metagenics Magnesium Glycinate

$33.75 for 120 tablets

Metagenics is the number one doctor-recommended professional supplement brand, trusted by more than 50,000 healthcare providers worldwide and with over 40 years in the practitioner channel. Their magnesium glycinate uses magnesium bis-glycinate at 100 mg elemental per tablet. Two tablets provide 200 mg daily at approximately $0.56 per day. The tablet format carries four other ingredients: microcrystalline cellulose, stearic acid (vegetable), croscarmellose sodium, and silica.

What it does well: 40 years of practitioner trust, genuine bisglycinate at 100 mg per tablet, trusted by 50,000+ healthcare providers.

Worth knowing: Tablet format carries more excipients than the capsule alternatives. Highest cost per serving in this comparison. The '4x better absorption' claim is a comparison against magnesium oxide, not other bisglycinate products.

Sports Research Magnesium Glycinate

$16.95 for 120 softgels

Sports Research offers a distinctive liquid softgel format rather than a standard capsule or tablet. Each softgel delivers 80 mg elemental magnesium — the lowest per-unit dose in this comparison. A two-softgel serving provides 160 mg; reaching 200 mg elemental requires three softgels. The softgel format includes coconut MCT oil and sunflower lecithin to support absorption, alongside a gelatin capsule shell — making this the only non-vegan product in this comparison. cGMP-manufactured in the USA and IGEN non-GMO tested. At three softgels per day, the 120-softgel bottle provides 40 days' supply at approximately $0.42 per day.

What it does well: Distinctive liquid softgel format, lowest bottle price in this comparison, cGMP-manufactured, IGEN non-GMO tested. Widely available.

Worth knowing: Contains gelatin — not vegan. Three softgels required for ~200 mg elemental. Longest other-ingredients list in the comparison. Cost per day rises once the three-softgel serving is factored in.

Cost per day at 200mg elemental magnesium

Prices are from brand websites and authorized retailers.

How to choose

If purity and a minimal other-ingredients list are the priority, Pure Powder Nutrition delivers non-buffered bisglycinate in a capsule with no fillers — the cleanest formulation in this comparison and most value in terms of total servings and cost per serve.

If practitioner endorsement and third-party certification rigour matter, Thorne has the most comprehensive quality programme here.

If you have multiple sensitivities and need the absolute shortest excipient list, Pure Encapsulations has two other ingredients.

If institutional credibility and doctor-recommended status carry weight, Metagenics has 40 years in the practitioner channel and is trusted by 50,000+ healthcare providers.

If a liquid softgel format suits you better than hard capsules, Sports Research is worth considering. Note that three softgels are needed for ~200 mg elemental and the product contains gelatin.

Frequently asked questions

What should I look for in a magnesium glycinate supplement?

Look for pure bisglycinate as the stated form, a short other-ingredients list without unnecessary fillers or binders, and GMP-certified manufacturing. The elemental magnesium figure in the supplement facts panel — not the total compound weight — is the only number worth using for dosing.

Is Sports Research magnesium glycinate good?

Sports Research uses a chelated bisglycinate form at 80 mg elemental per softgel, manufactured in a cGMP-compliant US facility and IGEN non-GMO tested. The liquid softgel format is distinctive. The main considerations are the three-softgel serving needed for ~200 mg elemental, the gelatin capsule shell (not vegan), and the longer other-ingredients list compared with capsule alternatives.

Is Metagenics magnesium glycinate good?

Yes — Metagenics uses genuine magnesium bis-glycinate at 100 mg elemental per tablet, with 40 years of practitioner trust. The main considerations are the tablet format, which carries more excipients than capsule products, and the higher cost per serving.

Is Thorne magnesium glycinate worth the price?

Thorne delivers a well-formulated, third-party certified bisglycinate product with a strong track record. The higher cost per serving partly reflects brand positioning and institutional endorsement. If practitioner-level certification matters to you, yes.

What does non-buffered magnesium glycinate mean?

Non-buffered means the product contains only magnesium bisglycinate — no magnesium oxide or other cheaper forms blended in. Check the other ingredients section: magnesium oxide should not appear.

Which magnesium glycinate supplement has the fewest other ingredients?

Pure Encapsulations has the shortest other-ingredients list — vegetarian capsule and ascorbyl palmitate only. PPN is a close second with capsule shell only — making it the most pared-back formulation in the comparison, with no fillers, binders, or flow agents alongside the active ingredient. Both are capsule products. Tablet and softgel formats require binders and additional excipients, which is why they typically carry longer lists.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.