Huberman mentions taking vitamin K2 on the MPMD podcast (link), saying that he noticed his cardiac markers improved after.

Vitamin K plays key roles in blood clotting, bone health and calcium transport.

There are two forms of vitamin K; K1 and K2. K1 is found naturally in plants, and has less bio-availability compared to K2, which is produced via bacteria fermentation, and found in fermented and animal products.

Huberman doesn’t mention the brand or dose of K2 he uses.

The adequate intake (AI) suggested by the NIH for vitamin K is 90 mcg for women and 120 mcg for men. Although they don’t state which form (K1 or K2).

There are two forms of vitamin K2, MK-4 and MK-7.

It is thought that MK-7 may have greater bio-availability than MK-4, and MK-7 can be converted into MK-4 in-vivo (in the body)28.