K-FORCE MAX by Ortho Molecular Products

This pairing fits adults correcting low Vitamin D, 25-Hydroxy who want structured repletion, not casual maintenance. It’s useful if you get little sun, have darker skin, live at northern latitudes, have higher body weight, or malabsorption. The MK-7 vitamin K2 is a smart add-on if you’re focused on bone density, especially post-menopausal women. If your level is only slightly low, daily 10,000 IU is usually more than you need; most maintain on lower vitamin D3.

Vitamin D3 raises 25-hydroxyvitamin D, which lets your gut absorb more calcium and helps keep parathyroid hormone (the signal that pulls calcium from bone) in a healthy range. Vitamin K2 as MK-7 activates osteocalcin (a protein that locks calcium into bone) and matrix Gla protein, MGP (a protein that keeps calcium out of arteries). Together they guide calcium to bone and away from soft tissues. That’s the rationale for pairing D3 with K2 in bone and cardiovascular strategies.

Take one capsule with a meal that contains fat for better absorption. This is a repletion-level dose; plan to recheck Vitamin D, 25-Hydroxy within 8–12 weeks, along with Calcium and, if needed, parathyroid hormone. If your level normalizes, step down to a lower maintenance vitamin D3 dose while continuing vitamin K2 if bone or arterial calcification risk is a concern. Time of day is flexible; consistency matters more.

Avoid high-dose vitamin D3 if you’ve had high calcium, recurrent kidney stones, sarcoidosis, or primary hyperparathyroidism unless your clinician is monitoring Calcium and 24-hour urine calcium. Do not pair vitamin K2 with warfarin or other vitamin K–blocking blood thinners. Use caution with thiazide diuretics (they raise calcium), and with orlistat or cholestyramine, which can reduce vitamin D absorption. Pregnancy and breastfeeding: use only under clinician guidance at this dose.