While BCAAs (branched-chain amino acids) are generally safe, some people may experience digestive side effects like diarrhea when taking them in high doses. This is because BCAAs can pull water into the intestines, which can increase bowel movements and potentially cause diarrhea.
However, this is typically only a concern if large amounts of BCAAs are consumed, which is generally not recommended. The recommended daily dosage of BCAAs is typically around 5-10 grams, and exceeding this amount can increase the risk of digestive side effects.
It's also worth noting that digestive side effects from BCAAs are not common, and most people are able to tolerate them without any issues. If you do experience diarrhea or other digestive issues when taking BCAAs, you may want to reduce your dosage or talk to a healthcare professional for advice.