Relative Efficacy of Vitamins D2 and D3 in Adult Humans

Vitamin D Status: Relative Efficacy of Vitamins D2 and D3

Vitamin D2 in chronic dosing will produce less of an elevation of serum 25(OH)D than will the same dose of vitamin D3.

Inclusion Criteria:

• willingness to withhold supplement use for duration of study
• willingness to avoid sun exposure for duration of study

Exclusion Criteria:

• vitamin D supplement use
• conditions that affect vitamin D metabolism by the body