L-Carnitine and some MICC formulations are often administered intramuscularly, especially when supporting fat metabolism or boosting energy
J Clin Pathol 34:292302
View Source Endocrinology Synergistic effects of growth hormonereleasing peptide and growth hormonereleasing hormone 1990 DOI: 10.1210/endo-127-6-3093 PMID: 2123433 Bowers CY, Reynolds GA, Durham D, Barrera CM, Pezzoli SS, Thorner MO View Source The Journal of clinical endocrinology and metabolism Prolonged stimulation of growth hormone (GH) and insulin-like growth factor I secretion by CJC-1295, a long-acting analog of GH-releasing hormone, in healthy adults 2006 DOI: 10.1210/jc.2005-1536 PMID: 16352683 Teichman SL, Neale A, Lawrence B, et al
A simple way to hold the difference: a peptide is a message, a short instruction that tells a specific cell to do a specific thing, while NAD+ is the battery and the spark, the coenzyme that keeps the cell powered enough to carry any instruction out
A new study suggests it is, but not for the reasons you might expect