Great product! I take one 500 mg capsule daily. My purpose with the supplement is cognitive improvement, aiding my studies and personal life. I am 25 years old and I am not affected by any disease, so the use of the supplement is just a "plus". I have had no side effects so far. I believe that if used in moderation, that is, in low doses and with medical monitoring will not have problem. About shipping, the order arrived in only 13 days, in my opinion it was excellent - very fast - considering that my address is in Brazil. And just confirming a previous comment from a colleague (I have not been taxed) just remembering that I made the purchase of only one product (Acetyl-L-Carnitine 100 VCapsules). In conclusion, I highly recommend the product! Brand / product quality NOW FOODS surprised me! I will definitely be back to buy the product - super reliable website!