Ive seen it both in acetyl-l-carnitine forms and just regular old l-carnitine. Theres also a mix of a few carnitine variants thats sold but from what ive gathered, looks like l-carnitine is the way to go. Ive heard good, but limited reviews on the subject. Of course its for sub-q injection - its basically cheap mesotherapy.
Everything ive seen is 200mg/ml - and it comes in 5ml amps from somewhere (not sure) but you could brew it yourself on the cheap im sure. Shit Id love to mix some up and try it out.
Bump for opinions and experiences.