Too much vitamin A, particularly from supplements or animal sources (retinol), can lead to toxicity known as hypervitaminosis A. Symptoms: Dizziness, nausea, headaches, dry skin, joint pain, and in ...

Vitamin K2 is considered safe. There has been no reported toxicity in studies with vitamin K2. Doses of vitamin K2 up to 45 milligrams (45,000 mcg) have safely been used in studies for up to two ...

Vitamin K2 has not been shown to cause harm or toxicity. Maximum upper levels or doses of vitamin K2 have not been established. Taking high doses of vitamin K2 is unlikely to cause adverse health ...