what is semaglutide mixed with B12: Benefits And Weight Loss, According To Experts – Forbes Health How to Reconstitute GLP-1 Semaglutide:

Chu J, Yang Y, Zhang K, Fu Y, Yuan B

(Article in Japanese)

Dash S, Murthy PN, Nath L, Chowdhury P (2010) Kinetic modeling on drug release from controlled drug delivery systems

Morris EM, Jackman MR, Johnson GC, Liu TW, Lopez JL, Kearney ML, Fletcher JA, Meers GM, Koch LG, Britton SL, Rector RS, Ibdah JA, MacLean PS, Thyfault JP (2014) Intrinsic aerobic capacity impacts susceptibility to acute high-fat diet-induced hepatic steatosis

L-Carnitine supports fat metabolism and energy production: L-Carnitine is found abundantly in muscle tissue and functions primarily to regulate fat metabolism and transport fatty acids into the mitochondria of cells, where they are oxidized and converted to energy

If levels do not correlate well, consider either dosing solely based on free phenytoin levels (if these can turn around rapidly enough) or avoiding phenytoin altogether