The term "B complex" is used to refer to a group of water-soluble vitamins that are essential for maintaining optimal health. These vitamins include thiamine, riboflavin, niacin, pantothenic acid, pyridoxine, biotin, folic acid, and cyanocobalamin. While "B complex" is a widely recognized term, there are a variety of other synonyms that can be used to refer to this group of vitamins. Some other common names include "B vitamins", "vitamin B complex", and "vitamin B complex supplement". Regardless of the name used, it is important to ensure you are getting enough B complex vitamins in your diet in order to maintain good health.