By Dr. Liji Thomas, MD Reviewed by Danielle Ellis, B.Sc. Oct 8 2024 The study found that consuming 5 g of nori per day for 4 weeks significantly improved vitamin B12 status in vegetarians.  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 found in eggs and dairy products, including cheese and yogurt, fermented tofu, kimchi, and mushrooms, among