Most D3+K2 supplements use the MK-4 form of K2. It's cheaper. It also clears your body within hours. MK-7 is the long-acting form. Studies suggest it stays active up to 3x longer than MK-4 alternatives, giving your body the time it needs to direct calcium where it belongs. D3 increases calcium absorption. K2 decides where it goes: bones and teeth, not arteries. Without the right form of K2, that job doesn't get finished.
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