The Claim

Supplementing with 2000 IU of vitamin D daily for 12 weeks significantly increases serum 25(OH)D levels by 58–95% in young, healthy men with baseline vitamin D deficiency, but this increase does not correlate with changes in testosterone, estradiol, cortisol, or SHBG levels.

Source: The Combination of a Diversified Intake of Carbohydrates and Fats and Supplementation of Vitamin D in a Diet Does Not Affect the Levels of Hormones (Testosterone, Estradiol, and Cortisol) in Men Practicing Strength Training for the Duration of 12 Weeks

What the research says

Supports is higher

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

Supports
48score
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.

Quantitative
1 study reviewed
In plain English

Taking 2000 IU of vitamin D daily for 12 weeks raises vitamin D levels in the blood of young, healthy men who were initially deficient, but this change is not linked to changes in testosterone, estradiol, cortisol, or SHBG levels.

See the scientific wording

Supplementing with 2000 IU of vitamin D daily for 12 weeks significantly increases serum 25(OH)D levels by 58–95% in young, healthy men with baseline vitamin D deficiency, but this increase does not correlate with changes in testosterone, estradiol, cortisol, or SHBG levels.

What the research says

1 study

  1. Study: The Combination of a Diversified Intake of Carbohydrates and Fats and Supplementation of Vitamin D in a Diet Does Not Affect the Levels of Hormones (Testosterone, Estradiol, and Cortisol) in Men Practicing Strength Training for the Duration of 12 Weeks

    Taking 2000 IU of vitamin D daily for 12 weeks raised vitamin D levels in young men, just like the claim says—but it didn’t change their testosterone, estrogen, or stress hormone levels.

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.

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