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But, this is only partially true

Inositol Inositol A carbocyclic sugar involved in cell signalling and fat metabolism

As a cofactor, cobalamins are essential for two cellular reactions: the mitochondrial methylmalonyl-CoA mutase conversion of methylmalonic acid (MMA) to succinate, which links lipid and carbohydrate metabolism, and the activation of methionine synthase, which is the rate-limiting step in the synthesis of methionine from homocysteine and 5-methyltetrahydrofolate

That is a significant subcutaneous injection

Temperature fluctuations

You can make finer dose adjustments (like stepping from 0.5 mg to 0.75 mg instead of jumping straight to 1.0 mg) and you can use split dosing strategies that pre-filled pens do not allow