Just some info for those using Carnitine for hyper symptoms. I use it and originally used l carnitine before changing to acetyl. Found both worked well but at a high dose 4000 -4500 mg daily. Less did not stop the palpitations completely. However I am now using an l carnitine product bought on eBay made by olimp-supplements. Seller was hemansupple. The capsules contain 1500mg L Carnitine each and I am taking 2 a day ( 3000mg) morning and night. It's got other stuff like green tea extract etc. It is working brilliantly even at the lower dose. Only on it a week but the last niggling symptoms have gone ( rashes/sun sensitive eyes ) Def the best Carnitine product I have tried. Not expensive either ! Just in case anyone is interested !