Does Whey Protein Cause Side Effects?
Whey protein is a
dietary supplement and an ingredient in certain foods and baby formulas. In general, it is not likely to cause significant side effects in most people. However, certain people may be at a high risk for side effects.
(This article covers many, but not all, of the possible side effects with whey protein. Your healthcare provider can discuss a more complete list of whey protein side effects with you.)
Reported Side Effects of Whey Protein
Some of the side effects of whey protein that were reported in studies included:
- Increased stool frequency
- Fatigue
- Loss of appetite
- Headaches
- Thirst
- Bloating
- Cramps.
Whey protein is derived from milk. Some unrefined forms of whey protein may also contain lactose, which can cause problems in people with
lactose intolerance. Also, people with milk
allergies may develop allergic reactions to whey protein (although some forms of whey protein are less likely to cause allergies). Seek immediate medical attention if you develop signs of an allergic reaction, such as:
- A rash or hives
- Itching
- Swelling of the lips, mouth, or throat
- Wheezing or difficulty breathing
- Diarrhea, vomiting, or blood in the stool (especially in infants).
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