The Claim

Daily supplementation with 8000 IU of vitamin D for 12 weeks significantly increases serum 25-hydroxyvitamin D levels from deficient (<50 nmol/L) to sufficient (>140 nmol/L) in young men, whereas placebo administration maintains serum 25-hydroxyvitamin D levels in the deficient range.

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

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
47score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Taking a daily vitamin D pill of 8000 IU for 3 months can boost vitamin D levels in young men from dangerously low to healthy levels, while those who take a fake pill (placebo) stay low.

See the scientific wording

Vitamin D supplementation at 8000 IU daily for 12 weeks significantly increases serum 25-hydroxyvitamin D levels from deficient (<50 nmol/L) to sufficient (>140 nmol/L) in young men, while placebo maintains deficient levels.

What the research says

1 study

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

    The study gave young men with low vitamin D 8000 IU a day for 12 weeks, and their vitamin D levels shot up to healthy levels — exactly what the claim says. The placebo group stayed low, so the supplement worked as described.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.