Does Vitamin B increase appetite? | Rounds Does Vitamin B increase appetite? | Rounds
Loading...

Does Vitamin B increase appetite?

Medical Advisory Board
All articles are reviewed for accuracy by our Medical Advisory Board.

Educational purpose only · Not a substitute for professional judgment or the full text of guidelines and labels.

Article Review Status
Submitted
Under Review
Approved

Last updated: July 14, 2026 · View editorial policy

Vitamin B Effects on Appetite

Vitamin B supplementation does not have consistent evidence for increasing appetite in people without deficiency. [1] In deficiency states, loss of appetite can occur, and correcting the deficiency can restore normal appetite. [2]

Evidence for Appetite Stimulation in Nondeficient States

Available evidence has been assessed as insufficient to show that vitamin B1 (thiamine) or vitamin B12 increases appetite or growth in humans who are not deficient. [1]

Vitamin B Deficiency and Appetite Loss

Thiamine (vitamin B1) deficiency is associated with loss of appetite. [2]

Practical Clinical Implication

Appetite improvement after “vitamin B” supplementation is most likely when an underlying B-vitamin deficiency exists. [1] [2]

When Further Evaluation Is Indicated

Persistent appetite loss warrants clinical evaluation for alternative causes such as gastrointestinal disease, depression, endocrine disorders, medication effects, or eating-disorder pathology. [2]

Safety Considerations

High-dose B-vitamin supplementation should be avoided without a deficiency indication because excessive dosing can produce adverse effects depending on the specific vitamin and formulation. [2]

Related Questions