Verdict: Thorne Magnesium Bisglycinate outperforms on absorption and GI tolerance according to WebMD and Healthline comparisons of chelated vs citrate forms. Natural Vitality Calm delivers higher elemental magnesium at lower cost but risks digestive discomfort. Thorne takes the win for most users prioritizing daily comfort over raw dosage.
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Winner: Thorne Magnesium Bisglycinate
Natural Vitality Calm Magnesium Citrate: 7.5/10
Thorne Magnesium Bisglycinate: 8.5/10
Spec-by-spec comparison
Natural Vitality Calm Magnesium Citrate
Thorne Magnesium Bisglycinate
Magnesium Type
Citrate
Bisglycinate
Elemental Magnesium
325 mg per serving
200 mg per serving
Form
Powder
Capsule
Absorption
Moderate with potential laxative effect
High with minimal GI impact
Natural Vitality Calm Magnesium Citrate
What works
325 mg elemental magnesium supports relaxation and sleep (per Healthline)
Powder format allows easy dose adjustment in water
Often used for occasional constipation relief
What doesn't
Can cause diarrhea or stomach upset at higher doses
Lower bioavailability compared to chelated forms
Thorne Magnesium Bisglycinate
What works
Chelated bisglycinate form offers superior absorption without laxative effects (per WebMD)
Gentle on stomach for daily long-term use
Supports muscle recovery and sleep quality
What doesn't
Lower elemental magnesium per serving than citrate options
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