NutriStack
Magnesium Glycinate and Vitamin D2, a synergy.
Magnesium is required for the body to convert Vitamin D2 into its biologically active form. With low magnesium status, supplemental D2 is metabolized less efficiently, so correcting magnesium can improve the response to vitamin D supplementation.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Magnesium Glycinate and Vitamin D2
- Pair type
- Synergy
- Evidence (highest tier)
- Strong
- Source citations
- 3 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Synergy · Strong evidence
Synergy
What is happening. Magnesium is required for the body to convert Vitamin D2 into its biologically active form. With low magnesium status, supplemental D2 is metabolized less efficiently, so correcting magnesium can improve the response to vitamin D supplementation.
Mechanism. Magnesium is an obligate cofactor for the enzymes that activate vitamin D2 (ergocalciferol). Both the hepatic 25-hydroxylase (CYP2R1) that converts ergocalciferol to 25-hydroxyvitamin D and the renal 1-alpha-hydroxylase (CYP27B1) that produces the active hormone 1,25-dihydroxyvitamin D are magnesium-dependent, as is the vitamin D binding protein that transports it. Magnesium insufficiency therefore blunts conversion of supplemental D2 into its active form, so raw blood levels can rise without a proportional functional response.
Recommendation. Ensure adequate magnesium status (roughly 200 to 400 mg elemental magnesium daily from diet plus supplement) when supplementing Vitamin D2, especially at higher D2 doses. No timing separation is needed; both can be taken with a meal. If vitamin D levels respond poorly to supplementation, check and correct magnesium first.
Minimum separation. None required; can be taken together.
Sources (3)
- Uwitonze AM, Razzaque MS. Role of Magnesium in Vitamin D Activation and Function. Journal of the American Osteopathic Association, 2018.
- Reddy P, Edwards LR. Magnesium Supplementation in Vitamin D Deficiency. American Journal of Therapeutics, 2019.
- Dai Q, et al. Magnesium status and supplementation influence vitamin D status and metabolism: results from a randomized trial. American Journal of Clinical Nutrition, 2018.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Magnesium Glycinate and Vitamin D2 are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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