Best Vitamin D3 K2 Supplements (2026)

MK-7 is a form of Vitamin K2 that is considered highly bioavailable, meaning your body can use it efficiently. All five picks on this guide use MK-7 as their K2 source. It works alongside Vitamin D3 to help support proper calcium utilization — D3 helps the body absorb calcium, and K2 MK-7 helps direct that calcium where it's needed, such as bones and teeth.

IU stands for International Units, the standard measurement for Vitamin D3 dosage. 10,000 IU is a high-potency dose — the NutraHarmony listing notes it equals 1,250% of the Daily Value. High-potency D3 is often chosen by adults with very limited sun exposure or increased nutritional demand. It's always a good idea to check with your healthcare provider before starting a high-dose supplement to make sure it's right for your individual needs.

Liposomal technology encases nutrients inside a tiny lipid (fat-based) layer, which is designed to protect them during digestion and support better absorption into the body. The UpNourish Liposomal D3 K2 uses this approach and pairs it with organic coconut oil. If maximizing bioavailability is a priority for you, a liposomal formula like UpNourish is worth considering.

Vitamin D3 and Vitamin K2 are both fat-soluble vitamins, which means they absorb more effectively when taken with dietary fat. Coconut oil is a convenient, neutral-tasting fat that can be incorporated directly into a softgel, removing the need to remember to take your supplement with a meal. The VEV Corefeel, VEV D3 K2, and UpNourish picks all use coconut oil for this reason.