These are a class of water-soluble vitamins that play important roles in cell metabolism. These are 8 types and together also called B complex.
B vitamins are essential to life and wellness, especially when it comes to nervous, brain, and cardiovascular system function.
In women- B vitamins are extremely important for the pregnant women who are breastfeeding. Vitamin B will aid in the fetal brain development and will also reduce the risk of birth defects.For pregnant women, B vitamins may boost energy levels, ease nausea, and lower the risk of developing preeclampsia.
In men B vitamins contributes to increase testosterone levels , which naturally decrease along with the age. They may also help to build muscle and increase the strength. However confirmed studies for these claims are still not there.
Source- Fresh fruits, vegetables, nuts , seeds, egg, fish and cheese. Curd and cheese are best source for vitamin B 12.
Taking vitamin B (B Complex) supplement on daily basis is a good habit for health
Can read more at https://www.healthline.com/health/food-nutrition/vitamin-b-complex