There are many different Injectable Clens out there.
There are vet grade products, and underground products.
As far as UG:
SPECTRO use to make an injectable Clen Product early on
QFS first came out with Helios, the most potent localised fat burner I've ever seen.
It came in 2 bottles, 100ml each,
First bottle: Injectable T3: 25mcg/ml
Second bottle: Injectable Clen/Yohimbine: 40mcg of clen, 5.4mg of Yohimbine per ml.
If you think Yohimburn is effective, this stuff will absolutely blow you away.
HOWEVER, It was VERY potent, a little too potent so you had to be careful, this stuff could mean a heart attack for many of us.
When QFS changed hands, I think the product was discontinued...but I'm not too sure.
I know QFS makes a Topical, Clen/PPA mix.