“The body typically excretes excess amounts of B12 through urine,” explains Trista Best, RD, a registered dietitian with Balance One Supplements. “However, taking very high doses of B12 ...

Study: Effect of roasted purple laver (nori) on vitamin B12 nutritional status of vegetarians: a dose-response trial. Image Credit: Jeong-Seon/Shutterstock.com Vitamin B12 is an essential nutrient ...