Vitamin K2 MK4 side effects
Across 29 first-hand reports, people mentioned a side effect 5 times (about 17 per 100 reports). The most common: fatigue, cold extremities, high blood. User reports show what people notice — they can't tell you whether Vitamin K2 MK4 is safe for you.
Reported side effects
fatigue1
cold extremities1
high blood1
delayed reflexes1
possible renal1
In their own words
“I stopped using high dose (5-15 mg) Vitamin K2 (MK4).”
“MQ-4 has a lot of good evidence in vitro and in animals, but the human studies I have seen show it does not reach the blood in meaningful amounts.”
Is Vitamin K2 MK4 safe? What the research covers
DResearch: None0 meta-analyses · 0 randomized trials on PubMed
None of the top reviews we found focus on safety. All research on Vitamin K2 MK4.