Recent research has quantified a striking difference in how vitamin D forms function within the human body. Analysis of comparative bioavailability data shows vitamin D3 achieves 87% absorption and activates immune response at 78%, while vitamin D2 demonstrates only 62% absorption with a 34% immune activation rate. The underlying mechanism involves enzymatic competition during metabolism, where D2 interferes with D3 processing. This interaction results in a documented 25% reduction in D3 levels when D2 supplements are administered. These findings, published in The Journal of Steroid Biochemistry and Molecular Biology, indicate that the form of vitamin D chosen for supplementation has measurable consequences for bioavailability and immune function. The data suggests current supplementation practices may be inadvertently reducing the therapeutic benefit of vitamin D at the cellular level.
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