The best peptide for arthritis may depend on the type of arthritis, the severity of symptoms, and the individuals overall health goals
Without testing, there is no way to distinguish between B12 deficiency and other causes of similar symptoms, no way to determine the severity of deficiency, and no way to select the most appropriate delivery method
Hair, skin, and nails: B12 supports cell reproduction, so hair, skin, and nail health can suffer when levels are low
Alternatively (and this is the approach I take for many patients), if you are experiencing significant symptomatic improvement then you can just continue to take the B12 shots indefinitely
Cyanocobalamin is the most famous of the B12 vitamins