Vitamin K2 100 mcg: What It Does and Who Should Take It
By 21st Century Vitamins and Supplements - For Adults, Women | Published: 2026-10-19
Category: Product Reviews
Learn what vitamin K2 100 mcg does for your body, who benefits most from supplementation, and how it supports bone and heart health.
Quick answer
Vitamin K2 100 mcg helps direct calcium to your bones and away from arteries, supporting skeletal strength and cardiovascular function. It's especially useful for people who don't get enough from diet or who take vitamin D supplements.
Why vitamin K2 form matters
Vitamin K2 comes in several forms, with MK-7 (menaquinone-7) being one of the most studied for its longer half-life in the body. This means a single daily dose can maintain steady levels, unlike shorter-acting forms that require multiple doses. The 21st Century Vitamin K2 100 mcg uses MK-7, which is naturally found in fermented foods like natto and in some animal products.
Who might benefit most
People over 50 often have lower vitamin K2 levels and may benefit from supplementation to support bone density. Those taking high-dose vitamin D or calcium supplements should also consider K2, as it helps ensure calcium is used properly. Vegans and vegetarians may be at higher risk for deficiency since K2 is mainly found in animal-based and fermented foods.
Dosage considerations
100 mcg is a common maintenance dose for general bone and heart support. Some research suggests higher amounts may be needed for specific conditions, but 100 mcg is a reasonable starting point for most adults. As with any supplement, it's wise to consult a healthcare provider, especially if you are on blood-thinning medications like warfarin.
Frequently asked questions
- What does vitamin K2 100 mcg do for your body?
- It activates proteins that help bind calcium to bone matrix and prevent calcium from depositing in artery walls. This supports both bone density and cardiovascular health.
- Who should take a vitamin K2 supplement?
- Adults over 50, people on vitamin D or calcium supplements, vegans, and those with limited intake of fermented foods or animal products are good candidates. Always check with your doctor if you take blood thinners. If you take vitamin D, pairing it with K2 helps ensure calcium goes where it's needed.
- Is 100 mcg of vitamin K2 enough?
- For general maintenance of bone and heart health, 100 mcg daily is a standard effective dose. Some individuals may need more based on diet or health status, but this amount covers most adults' needs.
Product facts
- Vitamin K2 100 mcg: 21st Century Vitamin K2, as Menaquinone-7 (MK-7), is a highly bioavailable form of vitamin K2 which is known to be found associated with fermented foods and animal products. MK-7 stays active in your body longer than other forms, so one daily 100 mcg capsule provides consistent support for calcium routing.
Vitamin K2 100 mcg
