Abstract Background In some in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) cycles. we may consider transferring one poor-quality embryo with one good-quality embryo. Previous studies have indicated that the poor-quality embryo transferred with a good-quality embryo does not negatively affect the clinical pregnancy rate or live birth rate. The purpose of this s... https://www.megavitamines.shop/product-category/b-12-methylcobalamin/