“Harvard Health provides an overview of studies linking high doses of vitamin supplements to a number of health problems.
The health body prefaces its assessment by saying: “Most supplements are safe to take, but there are exceptions.”
It says:
High doses of beta carotene have been linked to a greater risk of lung cancer in smokers
Extra calcium and vitamin D may increase the risk of kidney stones
High doses of vitamin E may lead to stroke caused by bleeding in the brain
Vitamin K can interfere with the anti-clotting effects of blood thinners
Taking high amounts of vitamin B6 for a year or longer has been associated with nerve damage that can impair body movements (the symptoms often go away after the supplements are stopped).”
“When a person uses a drug, there is generally an awareness that the benefit has to be weighed against the side effects. But if something is treated as a “nutrient,” especially an “essential nutrient,” there is an implication that it won’t produce undesirable side effects.” -Ray Peat
Author
Cari