l carnitine is a steroid or not Injectable l-carnitine has 100% bioavailability and it's supplement, steroid The effects of L-carnitine supplementation

TLK199 (Telintra

Vitamin B12 Injection Duration: 1 to 2 weeks, with some effects lasting up to a month Used for: Boosting energy, supporting red blood cell production, improving nerve health B12 is water-soluble and naturally eliminated through urine, so regular injections may be needed, especially if you have a deficiency or absorption issue (e.g., pernicious anemia or gastrointestinal disorders)

GHK-Cu has a low potential of inducing skin irritation and therefore provides a safer alternative for the delivery of copper through skin

Florenzano P, Ferreira C, Nesterova G, Roberts MS, Tella SH, de Castro LF, Brown SM, Whitaker A, Pereira RC, Bulas D, Gafni RI, Salusky IB, Gahl WA, Collins MT (2018) Skeletal consequences of nephropathic cystinosis

I have also been on nystatin in the past

NADs that express proteins mRNA, a single-stranded polynucleotide that carries genetic information, is essential for expressing encoded proteins within cells, thus exerting corresponding biological functions via these proteins