Taking a high-dose vitamin D pill every day for three months won't help young men who are low on vitamin D get stronger from weight training—and might even make them weaker compared to those who take a sugar pill.

47

Pro

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Against

Evidence from Studies

Supporting (1)

47

Community contributions welcome

47

Vitamin D supplementation does not enhance resistance training-induced gains in muscle strength and lean body mass in vitamin D deficient young men

Randomized Controlled Trial

Human

2021 Jul

The study gave young men with low vitamin D either a high-dose supplement or a sugar pill while they lifted weights. The ones who took the vitamin D didn’t get stronger in chest press and seated row as much as those who took the placebo—so the supplement didn’t help and might have made things worse.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Vitamin D supplementation does not enhance resistance training-induced gains in muscle strength and lean body mass in vitamin D deficient young men

Score: 47

DOI: 10.1007/s00421-021-04674-9

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