THORNE Vitamin D3 Supplement, 5,000 IU, 120 Capsules for Bone and Immune Support

THORNE Vitamin D-5,000 is a vitamin D3 supplement designed to support bone, immune, cardiovascular, and muscle health, with 5,000 IU per capsule and 120 capsules per bottle.

• 5,000 IU of vitamin D3 — supports the body's vitamin D needs in a capsule format.
• Cholecalciferol form — research shows D3 raises overall vitamin D levels more effectively than D2.
• Calcium absorption support — helps support healthy teeth and bones.
• Immune and cardiovascular support — addresses two additional areas of health.
• Muscle strength and cellular repair support — especially relevant for indoor athletes or people with limited sun exposure.
• NSF Certified for Sport — tested for label compliance and the absence of nearly 300 substances banned by many major athletic organizations.

Vitamin D is relevant to several body functions, and limited sun exposure can affect the body's natural vitamin D production. THORNE Vitamin D-5,000 is made for adults looking for vitamin D3 support, including athletes who train indoors. Its stated support areas include bone and tooth health, immune function, cardiovascular health, muscle strength, and cellular repair.

What health areas is THORNE Vitamin D-5,000 designed to support?

THORNE Vitamin D-5,000 is formulated to support healthy teeth and bones by enhancing calcium absorption. It also supports immune function and cardiovascular health. These are structure and function claims: the supplement is intended to support normal body functions, not to diagnose, treat, cure, or prevent disease.

• Bone and tooth support is linked to calcium absorption.
• Immune and cardiovascular function are additional intended support areas.

Why choose vitamin D3 rather than vitamin D2?

This formula uses vitamin D3 in the form of cholecalciferol. D3 is more potent and better absorbed than vitamin D2, also called ergocalciferol, and research shows it is more effective at raising overall vitamin D levels. That distinction makes the form of vitamin D a key consideration when comparing supplements.

• Vitamin D3: cholecalciferol.
• Vitamin D2: ergocalciferol.

How is this supplement suited to athletes?

THORNE connects vitamin D3 with support for muscle strength and cellular repair, particularly for athletes who train indoors or do not get adequate sun exposure for the body's natural vitamin D production. The product is NSF Certified for Sport, with testing for compliance with label claims and for the absence of nearly 300 substances prohibited by many major athletic organizations.

• Thorne is trusted by more than 100 professional sports teams.
• A 2026 independent survey of US supplement consumers and health-care practitioners ranked Thorne the #1 most recommended clinical brand.

With 120 capsules and 5,000 IU of vitamin D3 per capsule, this supplement suits shoppers seeking vitamin D3 support and athletes who value sport-focused testing. Its stated areas of support include calcium absorption, immune and cardiovascular function, muscle strength, and cellular repair.

Ingredients

One Capsule Contains: Vitamin D (as Vitamin D3) (5,000 IU) 125 mcg. Other Ingredients: Microcrystalline Cellulose, Hypromellose (derived from cellulose) capsule, Leucine, Silicon Dioxide, Vitamin E (d-Alpha Tocopheryl).