Vitamin B5, also called pantothenic acid, is one of 8 B vitamins. All B vitamins help the body convert food (carbohydrates) into fuel (glucose), which the body uses to produce energy. Its name originates from the Greek word ‘pantos’, meaning ‘everywhere’, as it can be found throughout all living cells.

Pantothenic acid occurs in the form of ‘coenzyme A’ (CoA), a vital coenzyme in numerous chemical reactions.

Functions
Vitamin B5 is critical to the manufacture of red blood cells, as well as sex and stress-related hormones produced in the adrenal glands, small glands that sit atop the kidneys. Vitamin B5 is a component of coenzyme A (CoA), an essential coenzyme required for chemical reactions that generate energy from food (fat, carbohydrates, and proteins).

Rich Foods
1) Chicken Liver 3 oz: 8.3 mg (83% DV)
2) Sunflower seeds 1 oz: 1.98 mg (20% DV)
3) Salmon (fish) 3 oz: 1.9 mg (20% DV) 
4) Avocados 1 fruit: 2 mg (20% DV) 
5) Sun-dried tomatoes 1 cup: 1.1 mg (10% DV)

6) Corn 1 cup: 1.18 mg (12% DV)
7) Broccoli 1 cup: 0.52 mg (5% DV)
8) Mushrooms 1 cup: 1.3mg (13% DV) 
9) Cauliflower 1 cup: 0.71 mg (7% DV) 10) Yogurt 1 cup: 1.45 mg (14% DV)

etc..
Overdose
Vitamin B5 is a water-soluble vitamin, which means that any excess vitamin is excreted in the urine. However, it is not impossible to overdose on vitamin B5.
 Excess vitamin B5 intake may lead to diarrhoea, heartburn, nausea, dehydration, oedema, joint pain, calcification in blood vessels and depression.

Deficiency 

 Vitamin B5
Fatigue, depression, irritability, insomnia, stomach pains, vomiting, Burning feet, upper respiratory infections, muscle cramps, numbness in toes, sleeplessness etc.