Tilt your head back and instil two drops into each eye
Its not FDA-approved, and selling it as a drug or supplement in the US isnt legal (source)
Is this routine for skin, hair or scalp care
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[21] Within cells, cyanocobalamin is converted to methylcobalamin and 5- deoxyadenosylcobalamin, coenzymes that participate respectively in homocysteine remethylation to methionine and in the isomerization of methylmalonyl-CoA to succinyl CoA, reactions essential for DNA synthesis, erythropoiesis, and myelin maintenance
[15] If a scheduled injection is missed, the patient should administer the dose as soon as remembered unless it is within 24 hours of the next scheduled dose, in which case the missed dose is omitted to prevent overlap