California Gold Nutrition, Magnesium Glycinate, 133 mg, 180 Capsules
The Supplement Facts panel declares 400 mg elemental magnesium from magnesium glycinate per three-capsule serving and no added melatonin, GABA or L-theanine. iHerb marks the SKU iTested and offers a product certificate. The overview also calls the formula buffered without naming a separate buffering salt, which reduces form transparency.
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Our Verdict
Product-specific iTested status and excellent active-ingredient value place it above uncertified options. It ranks below the first two because the buffered wording is not chemically resolved on the label, a material weakness in form and transparency.
Score Breakdown
Pros & Cons
Pros
- •iHerb displays product-specific iTested verification and a certificate link for this SKU
- •Provides 400 mg elemental magnesium in three capsules with all magnesium declared as from glycinate
- •Costs about $0.11 per 100 mg elemental magnesium
Cons
- •The overview says buffered, but the label does not identify a separate buffer or its proportion
- •The 400 mg serving exceeds the NIH adult upper limit of 350 mg per day from supplements and medications unless professionally directed
Specifications
| Elemental magnesium | 400 mg per serving |
| Magnesium form | Magnesium glycinate; iHerb overview describes it as buffered |
| Serving size | 3 veggie capsules |
| Servings per container | 60 |
| Added sleep ingredients | None; no melatonin, GABA or L-theanine |
| Third-party verification | iTested; product page displays third-party-tested status and a certificate link |
| Other ingredients / allergens | Hypromellose capsule, cellulose, magnesium stearate, stearic acid, silicon dioxide; vegan, non-GMO, gluten-free and soy-free |
Who Is This For?
Best For
- Buyers wanting a high elemental dose at a low active-ingredient cost
- People who value a published product-specific testing route
Not For
- Buyers requiring an explicitly unbuffered bisglycinate formula
- People instructed to remain below 400 mg supplemental magnesium
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
Thorne, Magnesium Bisglycinate, 6.5 oz (187 g)
Thorne
Each scoop supplies 200 mg of elemental magnesium as magnesium bisglycinate, with citric acid and monk fruit as the only other ingredients. The label positions the powder for pre-bedtime use, and the exact 187 g product is listed in NSF's Certified for Sport directory.
Natural Factors, Stress-Relax, Nighttime Magnesium Bisglycinate
Natural Factors
One scoop contains 200 mg elemental magnesium as bisglycinate plus 100 mg GABA, 50 mg L-theanine and 2.5 mg melatonin, with every active disclosed. It is explicitly labeled for bedtime and carries the ISURA Verified Clean and Non-GMO marks. This is a multi-ingredient sleep formula, not a magnesium-only product.
KAL, Chelated Magnesium Bisglycinate, 180 Tablets
KAL
Three tablets provide 315 mg elemental magnesium from fully chelated magnesium bisglycinate, with no added sleep actives. The label markets relaxation support and makes the elemental amount clear. KAL says it is lab-tested for purity and potency, but no named independent certification or public product-specific certificate was found.
Doctor's Best, High Absorption Magnesium, 100 mg, 240 Tablets
Doctor's Best
Two tablets supply 200 mg elemental magnesium from 2,000 mg Albion TRAACS magnesium lysinate glycinate chelate. The product is marketed for muscle relaxation and sleep support and contains no added melatonin, GABA or L-theanine. Its suggested adult use is two tablets twice daily, so the labeled daily regimen is four tablets and 400 mg elemental magnesium.