MAGNESIUM
Glycinate vs Citrate
Forms, label differences and what to compare before choosing.
Compare →Product vs product
Northfield Labs Magnesium Glycinate 200 mg vs Harbor & Pine Magnesium Glycinate (Buffered) 240 mg
Two “magnesium glycinate” bottles — why is one so much cheaper per 100 mg?
Why the prices differ
Both front labels say “magnesium glycinate”, but the Harbor & Pine label lists magnesium oxide in the parentheses too. Oxide is about 60% magnesium by weight versus about 14% for bisglycinate, so blending it in raises the magnesium per capsule and lowers the cost per 100 mg. The label doesn’t disclose how much comes from each form, so you can’t tell how much of the 240 mg is glycinate.
| Compare | Northfield Labs Magnesium Glycinate 200 mg | Harbor & Pine Magnesium Glycinate (Buffered) 240 mg |
|---|---|---|
| Brand | Northfield Labs | Harbor & Pine |
| Amount per servingFrom product label | 200 mg elemental magnesium | 240 mg elemental magnesium |
| Ingredient form (as labeled)From product label | Magnesium (as magnesium bisglycinate chelate) | Magnesium (as magnesium bisglycinate chelate, magnesium oxide) |
| Serving sizeFrom product label | 2 capsules | 2 capsules |
| Servings per containerFrom product label | 60 | 90 |
| Format | Capsules | Capsules |
| Price | $24.99 (demo) | $19.49 (demo) |
| Price per servingSuppScout calculation | $0.42 | $0.22 |
| Cost per 100 mg elemental magnesiumSuppScout calculation | $0.21 | $0.09 |
| Other ingredientsFrom product label | 3Hypromellose (vegetable capsule), Rice flour, Silicon dioxide | 2Gelatin (capsule), Magnesium stearate |
| CertificationsThird-party certification | None verified | None verified |
| Testing claimsManufacturer claim | “Third-party tested for purity and potency” — testing organization not named | None stated |
| Dietary characteristicsManufacturer claim | Vegan, Gluten-free | Not stated |
| Label completenessSuppScout calculation | 7 of 7 | 7 of 7 |
SuppScout calculation
Price and value
Northfield Labs Magnesium Glycinate 200 mg
Price (demo)
$24.99
Demonstration price — not current
Price per serving
$0.42
$24.99 ÷ 60 servings = $0.42
Cost per 100 mg elemental magnesium
$0.21
$0.42 per serving ÷ 200 mg × 100 mg = $0.21
SuppScout calculation Prices change often; confirm the current price with the merchant before buying.
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Demo Marketplace Demo merchantCheck price at Demo Marketplace$24.99 · In stock
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Demo Vitamin Shop Demo merchantCheck price at Demo Vitamin Shop$26.49 · In stock
SuppScout may earn a commission when you purchase through certain links. This does not affect how products are compared. Learn more.
Harbor & Pine Magnesium Glycinate (Buffered) 240 mg
Price (demo)
$19.49
Demonstration price — not current
Price per serving
$0.22
$19.49 ÷ 90 servings = $0.22
Cost per 100 mg elemental magnesium
$0.09
$0.22 per serving ÷ 240 mg × 100 mg = $0.09
SuppScout calculation Prices change often; confirm the current price with the merchant before buying.
-
Demo Marketplace Demo merchantCheck price at Demo Marketplace$19.49 · In stock
SuppScout may earn a commission when you purchase through certain links. This does not affect how products are compared. Learn more.
Understand the forms
MAGNESIUM
Glycinate vs Oxide
Elemental content, solubility and cost per 100 mg.
Compare →This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.