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Testosterone levels increased after vitamin D supplementation (342 from 320) – June 2015

  • presented at the American Urological Association’s annual meeting in New Orleans
  • ”The men who failed to correct the deficiency, on average, had total testosterone levels of 319.6 ng/L, while men who took supplements, and men with naturally sufficient levels of vitamin D, had total testosterone levels that averaged 341.7 ng/L (P=.012)”

Article did not mention dose size
Note: as little as 2,000 IU might be enough for most men, but some will need 4,000 IU or more.

See also VitaminDWiki