Short answer: Vitamin D3 is one of the formula's eight named ingredients, included alongside Zinc as part of the formula's testosterone-relevant mineral and vitamin support.
Why Vitamin D3 is grouped with Zinc under this specific role
Zinc is a mineral with a well-established relevance to normal testosterone production — Vitamin D3's inclusion reflects a complementary, foundational nutrient alongside this more targeted mineral.
Why this is a broader, foundational contribution rather than a headline claim
Unlike Ashwagandha's specific cortisol role or Testofen's specific libido research, Vitamin D3's role here is described more generally as testosterone-relevant support.
💡 Worth knowing: eight named ingredients, no proprietary blend — every ingredient, including Vitamin D3, is named plainly rather than hidden in an undisclosed blend.
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