Mayo and WebMD are quite skeptical of supplements. You will rarely find accurate information there. They reflect doctors in practice this way, as "anti-supplement".

For example when Dr. Weil suggests: "some evidence" suggests.... this is because the studies keep changing on this.
If you go to PubMed and put in acetyl carnitine, into the search you will find THOUSANDS of papers from all over the world.
Some of them will be better done studies than others.

Linus Pauling Institute usually has the most recent information.
But you will NEVER find 100% endorsement of any supplement anywhere. I wouldn't exactly call that RUMOR, but I would call it incomplete or non corroborated data.

This is also a good link. Your dose is not much more than found in beef steak.

http://ods.od.nih.gov/factsheets/Car...hProfessional/

The newest carnitine scare is mentioned in this article, about intestinal bacteria creating TMAO and perhaps leading to
some cardiovascular risks. But more work needs to be done on that. Carnitine is used in many medical treatment conditions today, and even in protection of mitochondria during chemo treatments with toxic drugs.

The "thyroid" worries are older data...new studies are showing the opposite.