Magnesium Bisglycinate

Name: Thorne Magnesium Bisglycinate
Brand: Thorne
Price: 28.00 USD
Availability: InStock

NSF Certified for Sport chelated magnesium with excellent bioavailability. Thorne's bisglycinate delivers 200mg elemental magnesium per serving in a form that's gentle on the stomach, backed by strong absorption data, and produced under pharmaceutical-grade manufacturing standards.

88/ 100

Biorank Score

Independently ranked

88/ 100

Biorank Score

Independently ranked by Biorank Laboratories

Our Verdict

Best in Class

Thorne Magnesium Bisglycinate earns the top magnesium score on BioRank for the combination of chelated form, NSF certification, and Thorne's pharmaceutical-grade manufacturing (cGMP+). Zero hype penalty — Thorne markets to practitioners, not influencers. The 200mg elemental dose per serving is clinically meaningful and the bisglycinate form has the strongest absorption-to-tolerability ratio of any magnesium form. Transparency score is high because Thorne publishes Certificates of Analysis and holds NSF Certified for Sport status.

Key Findings

NSF Certified for Sport — independent batch testing for purity, potency, and banned substances
Bisglycinate chelate achieves higher serum levels than oxide with 50-70% fewer GI side effects
200mg elemental magnesium per serving — clinically meaningful but not a full daily dose
Thorne manufactures under cGMP+ pharmaceutical-grade standards with published Certificates of Analysis
Zero hype penalty — practitioner-focused brand with no influencer marketing inflation

Evidence Analysis

Magnesium bisglycinate is a chelated form where magnesium is bound to two glycine molecules, significantly enhancing intestinal absorption compared to inorganic forms like oxide or sulfate. A 2017 study by Uysal et al. demonstrated that bisglycinate achieves higher serum magnesium levels than oxide at equivalent doses. The glycine chelate also reduces the osmotic laxative effect that plagues citrate and oxide forms, making it the best-tolerated oral magnesium. Thorne's product is NSF Certified for Sport, meaning every batch is independently tested for banned substances, heavy metals, and label accuracy — a level of verification fewer than 1% of supplement brands achieve.

Ingredient Breakdown

Ingredient	Dose	Effective Dose	Adequacy	Verdict
Magnesium (as Magnesium Bisglycinate)	200mg elemental	200-400mg elemental		Optimal

True Cost Analysis

Properly Dosed -- What You Pay Is What You Get

Listed Price

$0.47/serving

$14.10/month at 1 serving/day

True Cost Per Effective Dose

$0.47/effective dose

$14.10/month for effective dosing

Value Score

Excellent value

Save $6.60/month (47%)

by switching to NOW Foods Magnesium Glycinate

Where It Falls Short

At $0.47/serving, it costs roughly double what NOW Foods Magnesium Glycinate charges for a comparable form and dose. 200mg per serving means you still need dietary magnesium or a second serving to hit the 400mg daily target. The capsules contain only magnesium bisglycinate — no added cofactors like B6 or taurine that some formulas include for synergistic effects. Premium pricing is partly a brand tax, though the NSF certification does cost manufacturers significantly to maintain.

Best For

Athletes and tested competitors who need NSF Certified for Sport verification
Anyone seeking the best-absorbed, gentlest magnesium form available
Sleep and recovery support with minimal GI side effects
Those who prioritize third-party testing and pharmaceutical-grade manufacturing

Not Ideal For

Budget-conscious buyers (NOW Glycinate is half the price for a similar form)
Those specifically targeting cognitive benefits (Magtein/L-Threonate is better studied for brain)
People who want a single supplement to cover the full 400mg daily magnesium target
Those who prefer all-in-one formulas with added cofactors