Can You Have Too Much Vitamin B12?
B12 is a water-soluble vitamin. That is the reason it is considered relatively safe even at high doses. So far, no Tolerable Upper Intake Level (UL) has been established for B12. This is due to a low level of toxicity. The maximum daily dose of a vitamin is unlikely to cause any significant side effects. Your body excretes excess vitamin B-12 through urine.
However, supplementing excessively high levels of B12 can have some adverse effects. It can lead to acne and cause rosacea in some people. It can also lead to adverse health outcomes in people struggling with diabetes and kidney disease.
Individuals struggling with diabetic nephropathy might experience a more rapid decline in kidney function when they take unusually high doses of vitamin B-12. Another study showed that pregnant women’s exposure to extremely high doses of vitamin B12 could lead to the risk of autism spectrum disorder in an unborn child.
Hence, it is essential to take your healthcare provider onboard before including any new supplement into your diet or making any kind of lifestyle alterations, especially when you are dealing with certain health conditions or are pregnant.
Please note that all the risks mentioned are only associated with extremely high doses of vitamin B12.