Simple Nutrition
The yeast Candida albicans can synthesise carnitine, and while it is not clear whether this is possible in bacteria, they can acquire it from the environment or from metabolic precursors, as it is used in protection against environmental stresses in some species
Biomaterials 30 (4), 583588 (2009)
2) including thiamine (vitamin B1 ), pantothenic acid (vitamin B5 ), Biotin (vitamin B7 ), and pyridoxine (vitamin B6 ) were (His41, Met49, Tyr54, Leu141, Asn142, Cys145, His163, His164, Met165, Glu166, His172, Asp187, Leu141, Gly143, Ser144), (Leu141, His163, His164, Asp187), (Leu141, Gly143, Ser144, Cys145), and (Cys145), respectively
It's important to note that these are animal studies, and results from animal research don't automatically translate to humans