Many beginners face this due to outdated information, complex ingredient lists, or unfamiliar compounds like copper peptides
The CDC recommends waiting at least three months after a COVID-19 infection before getting vaccinated

Diorsnow Essence of light brightening milk serum Ingredients:water, glycerin, dimethicone, propanediol, butylene glycol, ascorbyl glucoside, pentylene glycol, polyglyceryl-10 myristate,polymethylsilsesquioxane, alcohol, tromethamie, phenoxyethanol, acrylates/c10-30 alkyl acrylate crosspolymer, cellulose, maltitol, silica, sodium citrate, dipotassium glycyrrhizate, PEG-7 glyceryl cocoate, CI 77891 (titanium dioxide), parfum, citrus unshiu peel extract, ectoin, sapindus mukurossi peel extract, citrus medica limonum fruit extract, synthetic fluorphlogopite, alcaligenes polysaccharides, biosaccharide gum-1, citric acid, aluminum hydroxide, leontopodium alpinum extract, tremella fuciforms polysaccharide, limonene, potassium sorbate, stearic acid, alpha-isomethyl ionone, kluyveromyces extract, linalool, citronellol, poriacocos sclerotium extract, sodium benzoate, sodium chloride, BHT, sodium DNA, disodium phosphate, ergothioneine, potassium chloride, potassium phosphate

published research uses precursors that the body converts to NAD+
(Lipoic acid) : (thioctic acid) - : , - : ,
If you are deficient in vitamin B12, then the injections are very effective at raising your blood levels