Vitamin B50 Complex Prolonged Release Tablets, 100 ct, QC98048 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Helps convert food into energy and helps maintain chemical balance. Prolonged release vitamins slowly release nutrients into the body over an extended period of time. No added sugar, salt, yeast, preservatives, artificial flavors or colors, and gluten-free.