Compress rubber head to fill dropper
I did some more research and it looks like cyanocobalamin is used for b12 shots in the USA (where I am) and has aluminum while hydroxocobalamin doesn't have aluminum and is used for b12 shots in the UK

Sources: Journal of Translational Medicine , National Library of Medicine Do More, Age Less B12/MIC INJECTION BENEFITS Feel energized while fighting off fatigue Ignite your metabolism to support weight loss goals Enhance your mental clarity, focus & memory Support your liver to flush out toxins & naturally detox your body Maintain the connections between neurons (called synapses) to potentially offset the risk of Alzheimers* B12/MIC Injections How It Works Unique combination of vitamin B12 + methionine, inositol, choline (MIC) Methionine is an essential amino acid that helps break down excess body fat in the liver Inositol is a B-complex vitamin that helps metabolize fats, regulates appetite, and may help with overall mood Choline is an essential nutrient that promotes liver function and helps regulate "bad" cholesterol B12, an essential vitamin the body needs but can't produce, magnifies all of MIC's benefits What AgelessRx customers are saying The above testimonials are from real AgelessRx customers sourced from Trustpilot.com

I had vitiligo for years without realising it was that
However, the absence of human clinical trials means the safety profile in humans is entirely unknown
However, B12 supplementation does support those with hepatitis C and children of pregnant women