K-FORCE by Ortho Molecular Products

If your Vitamin D, 25-Hydroxy is low or in the lower-normal range, a daily vitamin D3 and K2 capsule like this fits as a repletion-leaning dose. It’s practical for darker-skinned adults, indoor or northern-latitude lifestyles, and post-menopausal women focused on bone density. It also suits people with low dietary vitamin K2 intake (few fermented foods). If your level is already robust, this is more than a maintenance dose, so retest and adjust.

Vitamin D3 raises calcium absorption from the gut and helps dial down parathyroid hormone (the signal that pulls calcium from bone). Vitamin K2 as MK-7 activates osteocalcin (the protein that locks calcium into bone) and matrix Gla protein (the protein that helps keep calcium out of artery walls). MK-7 has a longer half-life than K1 or MK-4, so it stays active through the day. Expect Vitamin D, 25-Hydroxy to rise within 4–8 weeks; bone turnover shifts take months.

Take 1 capsule daily with a meal that contains fat for absorption. 5,000 IU of vitamin D3 is often used short term if your level is low, then many people step down once replete. Recheck Vitamin D, 25-Hydroxy after 8–12 weeks, and consider Calcium and parathyroid hormone on the same draw. Adequate dietary calcium and magnesium matter; low magnesium can blunt vitamin D response.

Skip K2 if you use warfarin or similar vitamin K–blocking blood thinners; dose stability of these drugs depends on consistent vitamin K, so involve your prescriber. Thiazide diuretics (blood pressure pills that reduce calcium loss) plus high-dose D3 can raise calcium. Orlistat (fat-blocking weight-loss drug) and bile acid sequestrants like cholestyramine (cholesterol binders) reduce absorption of fat-soluble vitamins; separate by several hours.

Use clinician guidance if you have a history of high calcium, recurrent calcium kidney stones, hyperparathyroidism, sarcoidosis or other granulomatous disease (these can overshoot active vitamin D), severe kidney disease, or you’re pregnant and considering more than a maintenance dose. If your Vitamin D, 25-Hydroxy is already high, lower-dose vitamin D3 without extra K2 is usually more appropriate.