l carnitin fumarat L-Carnitine Fumarate Apple Flavor Dietary Supplement by Fresh Dose Olympian Labs L-Carnitine Fumarate 500

Normally bioavailability is referenced when discussing drugs administered orally, but it can relate to drugs administered by other methods such as transdermally

10.1021/acs.analchem.9b05675 420 ZhangL.WangH.ZhaoG.LiN.WangX.LiY.et al (2021a)

Modulation of oncogene of the tumor suppressor gene expression: an approach to the gene therapy of cancer

And I'm like, what I think, and I just wish people could understand this subtle nuance, is in the end, yes, it is calories because it is, if you gain weight, but it's not calories in, calories out, it's if you gained weight, you stored more calories than you burned, like period