Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.
Evidence strength
70/100Strong
WEAKLIMITEDMODERATESTRONGVERY STRONG
What the evidence supports: the vitamin D component; added benefit from K2 is plausible but less established.
This scores how well-supported the claim above is — not how much benefit you personally would get. A high score on a narrow claim does not extend to everything the product is marketed for.
How long to take it
Ongoing, as with vitamin D by itself.
Who it's actually for
Anyone taking vitamin D long-term who wants fewer bottles.
Safe upper limit
Unverified
Governed by the vitamin D limit: 100 mcg / 4,000 IU per day
Same as vitamin D alone. The K2 component is the reason to avoid it on warfarin.