THORNE Vitamin D3 Supplement, 5,000 IU, 60 Capsules for Bone and Immune Support

THORNE Vitamin D-5,000 is a vitamin D3 supplement formulated to support bone, teeth, immune and cardiovascular health, with 5,000 IU strength and 60 capsules per bottle.

• Vitamin D3 as cholecalciferol — supports calcium absorption for healthy teeth and bones.
• 5,000 IU strength and 60 capsules — provides a clearly defined capsule count and vitamin D3 strength.
• NSF Certified for Sport — tested for label-claim compliance and the absence of nearly 300 substances banned by many major athletic organizations.
• Vitamin D3 rather than D2 — research shows D3 is more effective at raising overall vitamin D levels.
• Made with indoor-training athletes and people with limited sun exposure in mind — supports the body's natural vitamin D production needs.

Vitamin D helps the body absorb calcium, and the formula is designed to support several functions that matter in everyday wellness and athletic training. It may be relevant for people who train indoors or get limited sun exposure, when the body's natural vitamin D production may be lower. THORNE Vitamin D-5,000 offers vitamin D3 in capsule form, with a defined strength and count for shoppers comparing supplement options.

What does THORNE Vitamin D-5,000 support?

THORNE Vitamin D-5,000 is formulated to support healthy teeth and bones by enhancing calcium absorption, as well as immune function and cardiovascular health. Vitamin D3 also supports muscle strength and cellular repair, with particular relevance for athletes who train indoors or have limited sun exposure. These are support claims, not a promise of a specific result.

• Vitamin D3 is provided as cholecalciferol.
• The formula is intended to support the body's natural vitamin D needs.
• It comes in a 60-capsule bottle.

Why choose vitamin D3 instead of vitamin D2?

THORNE Vitamin D-5,000 uses cholecalciferol, the D3 form of vitamin D. Vitamin D3 is more potent and better absorbed than vitamin D2, also called ergocalciferol; research also finds D3 more effective at raising overall vitamin D levels. This makes the form of vitamin D a useful comparison when choosing a supplement.

• Vitamin D3 form: cholecalciferol.
• Vitamin D2 is also known as ergocalciferol.

What does NSF Certified for Sport mean for this supplement?

THORNE Vitamin D-5,000 is NSF Certified for Sport. The certification includes testing for compliance with label claims and screening for the absence of nearly 300 substances banned by many major athletic organizations. This testing is relevant to athletes who need to consider banned-substance screening when selecting supplements.

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

THORNE Vitamin D-5,000 may suit adults looking for a vitamin D3 supplement to support bone and teeth health, immune function, cardiovascular health, muscle strength or cellular repair, including athletes who train indoors or have limited sun exposure. Its 5,000 IU strength, 60-capsule count and NSF Certified for Sport status make its key format and testing details clear for buyers comparing vitamin D3 supplements.

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).