Vitamin D + K2

The combination Vitamin D + K2 formula by Thorne is ideal for those wanting to support bone, cardiovascular, and immune health.* If you’re unsure whether you need vitamin D supplementation, we recommend having your vitamin D levels tested to help determine if supplementation is appropriate for you.

We test every ingredient in Vitamin D + K2 for identity, purity, and potency to ensure every ingredient and finished product meets our strict quality standards at the time of manufacture and up to the product’s expiration date. This includes checking for contaminants like heavy metals, pesticides, and harmful microbes. When a product carries an NSF Certified for Sport® mark, it signifies that the product has been tested for compliance with label claims and to ensure the absence of nearly 300 substances banned by major athletic organizations.

Vitamin D3 is generally considered the preferred form of vitamin D because research shows it is more effective at raising and maintaining healthy vitamin D levels in the blood than vitamin D2. Both forms support bone health and overall vitamin D status, but D3’s greater ability to sustain optimal levels is why it’s commonly recommended in supplements.*

Vitamin D3 and vitamin K2 work synergistically in the body. For individuals supplementing with vitamin D, adding vitamin K2 can provide complementary support for bone and cardiovascular health.* Whether you need to take both vitamins depends on a variety of individual health factors and is best discussed with your health-care provider. If you are taking blood-thinning medication, consult your health-care professional before using vitamin K-containing supplements.

Vitamin D and K2 are more effective when taken together than either alone. While vitamin D enhances the absorption and retention of calcium, vitamin K2 helps direct the absorbed calcium into the appropriate parts of your body, such as bones and teeth, and keep it out of soft tissues like arteries and kidneys, where you don’t want excess calcium to build up.*