Vitamin D3

vitamin

Human Trials

Cholecalciferol, the form of vitamin D synthesized from sunlight. Extensively studied for bone health, immunity, and metabolic function.

Mechanism

Acts as a pro-hormone — converted to calcitriol, which binds the vitamin D receptor and regulates expression of hundreds of genes.

Sourcing

Third-party tested brands only
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Thorne

Thorne Vitamin D3

Verified
  • NSF Certified
  • cGMP manufactured
  • Third-party tested
  • Clean label
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Momentous

Momentous Vitamin D3

Verified
  • NSF Sport certified
  • Clinically dosed
  • Athlete-trusted
  • Subscribe & save
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