Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Causes acne that never goes away....

about 2 months of taking this, i started to break out with acne. i have alway had flawless skin even as a teen. I did not change anything about my diet except adding biotin daily. My hair grew some but in exchange for the unbearable acne, no thank you. Now, 2 months later I am still still struggling with acne. I have spent hundreds on buying acne mendications and my skin is scarred now too. I can't leave the house without makeup an dbefore I never wore makeup. Just stick with a balanced diet and dont put this in your body.