Supplements Guide: Side Effects & Best Multivitamins

Vitamins and supplements like melatonin and fish oil offer health benefits but can cause side effects if misused. Learn about the impact of saw palmetto on blood pressure and find the best multivitamins for young women and adults over 50.

Why does Vitamin B12 Cause Acne?

Published Aug,17 2011 | By Mandy Dunlop

Acne is caused by the overproduction of sebum, an oily substance secreted by the sebaceous glands in the skin. Excess oil makes the skin pores sticky, allowing dirt and sebum to become trapped inside. When these bacteria stay below the skin surface, a whitehead is formed.

Mandy Dunlop is a nutritionist, health writer and registered nutritional therapist. She has written for various Irish magazines such as "Stellar" and is the leading nutrition expert for eNutritionist, a personal nutrition website. Dunlop holds an honors Bachelor of Science in human nutrition from the University of Ulster, Northern Ireland, as well as a diploma in nutritional therapy.