Im experiencing stomach pains while taking Biotin tablets

Patient: Hi I was just going to ask a really quick question about medication that I normally take. I have been taking Lymecycline for a 8 months and Concerta for ADHD for about 6 years so far and I was wondering if I can take 1000mg of biotin with them every day is that safe or would something go wrong if I combine them together. Because I’ve already experienced stomach cramps.

Symptoms: Stomach pains

Doctor: