Some factors that may affect the optimal dosage for L-carnitine are: Age : Older adults may need higher doses of L-carnitine to compensate for the decline in endogenous synthesis and absorption
[unverified no linkable source] Vendor-assigned expiry and temperature-stability handling conventions for lyophilised peptides
References Carney JM, Starke-Reed PE, Oliver CN, Landum RW, Cheng MS, Wu JF, et al
It just has to be rooted
The copper-bound peptide, Glycyl-L-Histidyl-L-Lysine-Copper(II) (GHK-Cu), is a naturally occurring complex ubiquitous in human biological fluids such as plasma, saliva, and urine
Vitamin B12 is a water-soluble vitamin, and your body doesnt store it, so you must consume it on a regular basis in order for your body to function properly