Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Watch out for side effects

My experience with this product was very bad. I developed a persistent allergic reaction with swollen skin and itchy rash on my thighs, waist and shoulders. Contrary to another reviewer's coment, there is plenty of information about HMB side effects: Breathing problems; or tightness in your throat or chest; Chest pain; Skin hives, rash, or itchy or swollen skin. There was no noticeable benefit. Your 'mileage' may vary, but use with caution!