Natural Factors Vitamin D3 2500 IU 180 Softgels

Vitamin D3 is the form of vitamin D naturally produced by the body in response to sunlight. It supports calcium absorption, immune function, muscle performance, and healthy bones and teeth. Vitamin D3 works especially well alongside vitamin K2, helping increase calcium absorption while K2 helps direct that calcium into bones where it belongs.

If you're building a stack focused on immune resilience, stronger bones, optimal calcium metabolism, and maximizing the benefits of vitamin K2, this is a supplement that may be worth exploring.