best needle size for b12 injections Amazon.com: Ulove Prs 12 Pack 1ml Industrial Syringes with 25Ga 1 Inch Needle, Plastic Disposable Syringe and Scientific Labs, Liquids Refilling and Measuring : Industrial & Scientific Is this the right size
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AHK-Cu (Copper Tripeptide-3) 1% serum, glycol-free, made in the UK

it is a methylated quinolinium derivative used as a chemical probe in metabolic and ageing research

Scientific Reports 12:484

It helps produce red blood cells, supports nerve function, and is vital for DNA synthesis
