Micronutrients & recovery
Vitamin D supplementation has no significant effect on muscle mass or muscle power in the general population.
Do not take Vitamin D expecting to build more muscle or become more explosive. The data shows no benefit for muscle mass or power. Its value lies in supporting baseline strength, especially if you are deficient.
No significant effect was found on muscle mass (SMD 0.058; p=0.52) or muscle power (SMD 0.057; p=0.657).
Why this rating
Low evidence quality per GRADE due to few studies (6 for mass, 5 for power) and small sample sizes.
Source
The Effects of Vitamin D on Skeletal Muscle Strength, Muscle Mass, and Muscle Power: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Charlotte Beaudart et al. · The Journal of Clinical Endocrinology & Metabolism · 2014
DOI 10.1210/jc.2014-1742
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