Solaray High Absorption Magnesium Glycinate 120 VegCaps

This review covers that exact formula, not an Extra Strength 500 mg product, a powder, or a differently sized bottle. It is a label-and-evidence review; we have not conducted a taste test, laboratory analysis, or controlled comparison of its effects.

The label at a glance

The official Supplement Facts image is the source for these quantities. Magnesium stearate appears as an excipient; it should not be treated as an additional declared dose of elemental magnesium. [1]

View the manufacturer’s Supplement Facts label

View original manufacturer label

Manufacturer label; check the package you receive for changes.

Who may prefer this format—and who may not

The capsule format may suit someone who dislikes preparing a drink and wants individually counted units. The bottle is also easy to compare with other capsules once the four-unit serving is understood.

Before altering a capsule, read which capsule-opening instructions have actually been confirmed.

It is a less obvious fit for someone who wants one capsule to provide the full labeled amount, has difficulty swallowing capsules, or specifically avoids black-pepper extract. For that last preference, Solaray’s powder is a materially different formulation: its label lists magnesium and citric acid, without BioPerine. The powder introduces its own measurement and mixing requirements. [2]

Neither label establishes that one format will work better for your symptoms. The format question and the clinical need for supplementation are separate decisions.

What 120 capsules actually buys

The calculation is:

120 capsules ÷ 4 capsules per serving = 30 label servings.

For quantity comparison, 350 mg ÷ 4 = 87.5 mg magnesium per capsule. That is useful arithmetic, not a prescription to take a particular number of capsules or to divide capsule contents. The listed magnesium amount is already the elemental nutrient amount; do not apply another “percentage of magnesium” calculation to it. [1] [3]

A 120-count bottle therefore should not be compared with a competing 120-count bottle as though the serving count were automatically identical. Pure Encapsulations’ reviewed label, for example, lists 120 mg in one capsule; NOW’s tablets list 200 mg in two tablets. The relevant denominators differ. [4] [5]

Compare the exact labels in Solaray versus NOW magnesium glycinate, including four capsules versus two tablets.

Does BioPerine make it better absorbed?

The label establishes that the ingredient is present, not how much additional magnesium this finished product delivers into the body. A black-pepper extract claim, an ingredient mechanism, and a study of the complete capsule are different types of evidence.

We did not establish a direct human trial showing a specific absorption advantage for this exact Solaray capsule over the other products compared here. It would therefore be misleading to attach a percentage improvement to the 5 mg BioPerine amount or to turn its presence into a guaranteed benefit. People taking medicines should include the full formula—not just the magnesium amount—when discussing suitability with a pharmacist. [1]

Price: compare a confirmed bottle, not the lowest page number

The exact 120-capsule variant is listed at $18.39 by Solaray on September 27, 2026: about $0.61 per full serving and $0.175 per 100 mg magnesium. Tax and shipping are excluded. [6]

Once the correct price is available, the calculations are simple:

Cost per label serving = bottle price ÷ 30.

Cost per 100 mg magnesium = bottle price ÷ 10,500 × 100.

The 10,500 mg denominator is 30 servings multiplied by 350 mg. The second calculation standardizes cost, not clinical effectiveness. Use the same purchase conditions when comparing: one-time purchase with one-time purchase, with tax, shipping, and any discount identified separately.

Check price at HerbsProHerbsPro: $18.39 for High Absorption Magnesium Glycinate, 350 Mg, 120 Veg Caps, checked October 5, 2026. Price and stock can change; confirm the current bottle label.

Safety matters before the serving count

The US adult upper limit for magnesium from supplements and medications is 350 mg daily. It does not include magnesium naturally present in food. A full serving of this product reaches that supplemental limit before other magnesium supplements or magnesium-containing medicines are considered. This is a safety benchmark, not a statement that everyone needs 350 mg or that a lower intake cannot cause diarrhea. [3]

Magnesium supplements can cause gastrointestinal effects and require particular caution with impaired kidney function. They can also interfere with absorption of some medicines, including certain antibiotics and oral bisphosphonates. Ask a pharmacist about the specific medicine and timing rather than adopting one spacing rule for everything. [3]

Alternatives that solve different problems

These differences are supported by the respective labels and certification record, not a claim that the products are interchangeable at their full serving sizes. [2] [4] [5] [7] [8]

Related reading

For the practical trade-offs of scooping and swallowing, see our magnesium powder-versus-capsule comparison.

For the arithmetic behind capsules, servings, and nutrient quantities, see our serving-size and dose guide.