Super K2 is a doctor-formulated dietary supplement that delivers 200 mcg of vitamin K2 as MK-7 (menaquinone-7) per vegetarian capsule. It is designed to support normal vascular function, healthy bones, and the body's calcium metabolism as part of a balanced diet and active lifestyle. The formula is intentionally simple, just K2 in its most studied long-chain form, with a hypromellose vegetarian capsule and rice flour as the only other ingredients.

Both K1 and K2 are forms of vitamin K, but they behave quite differently in the body. Vitamin K1 (phylloquinone) is found mainly in leafy greens and is used primarily by the liver to support normal blood clotting. Vitamin K2 (menaquinone) is found in fermented foods, certain animal products, and natto, and circulates beyond the liver to tissues like bone and the vascular system. Although Americans typically get reasonable K1 from diet, K2 intake from food is much lower because few people regularly eat natto, hard cheeses aged with specific bacteria, or organ meats.

Both are forms of vitamin K2, but they differ in their carbon side-chain length and how the body handles them. MK-4 has a short half-life (around an hour) and is typically dosed in larger amounts, often 15 mg or more, to maintain blood levels. MK-7 has a much longer half-life (around 72 hours), so a smaller dose maintains steady blood levels with daily use. This is why MK-7 is the form most commonly studied in modern bone and cardiovascular research, and why Super K2 uses MK-7 specifically at 200 mcg per capsule.

The calcium paradox describes a pattern where the body has too much calcium in the wrong places (such as arterial walls) and not enough in the right places (such as bones), often at the same time. Dr. Colbert teaches that the typical American diet sets this up directly, with a 10-to-1 calcium-to-magnesium ratio (cheese alone runs about 25-to-1) when the body needs closer to 1-to-1. Without enough magnesium and vitamin K2 to direct calcium properly, calcium accumulates in arteries rather than supporting bone strength.

Vitamin K2 acts as a cofactor for two key proteins. The first is osteocalcin, which helps direct calcium into bones and teeth where it belongs. The second is matrix Gla protein (MGP), which helps keep calcium out of soft tissues like blood vessel walls. In Dr. Colbert's words, K2 "literally works on this GLA matrix proteins that prevent arterial calcifications, especially when combined with magnesium." This product is not intended to diagnose, treat, cure, or prevent any disease, including cardiovascular or bone-density conditions.

Yes, this is one of the most common reasons people add K2 to their daily routine. Taking calcium without K2 means relying on your body's existing K2 status to direct that calcium properly. Pairing the two gives the calcium-handling system the cofactor it needs to function well. Super K2 works alongside calcium-containing products like Silical 1 (which provides 500 mg of calcium, 100 mg of magnesium, and 1,000 IU of vitamin D3) for a more complete bone-mineralization approach.

Dr. Colbert pairs the two daily and considers them his two most important vitamins, with vitamin D3 first and vitamin K2 second, specifically because of K2's role in supporting arterial health. The two work in different parts of the same calcium-handling system. Vitamin D3 supports the body's ability to absorb calcium from the digestive tract. Vitamin K2 supports the GLA matrix proteins that help direct that calcium into bones and teeth and away from arterial walls. Taking D3 without K2 means relying on your body's existing K2 status to direct the absorbed calcium properly, which is why Dr. Colbert recommends pairing them.

Dr. Colbert recommends that adults aged 50 and older take K2 daily and suggests starting in the late 40s or early 50s as a foundational long-term habit, since most Americans get very little K2 from food (the richest dietary source is natto, a fermented soybean dish rare outside of Japan). He personally takes Super K2 twice a day, every day, alongside magnesium for the same arterial-support reason. Super K2 also pairs naturally with the 1,000 IU of vitamin D3 in Silical 1, which is part of why many customers use the two together as a complete D3 + K2 + calcium + magnesium foundation.