how to inject yourself b12 Injections at Home - Safety Guide for Self-Administration How to Give B12 Injections
Description
The only efficient way to restore vitamin b12 levels is to administer vitamin b12 injection for cats, as it replenishes the levels quickly without creating any toxicity

You will be given a tracking number and the date your parcel is expected to be delivered, as well as the chance to choose how and where you like to receive it
References Rashid, S, Meier, V, Patrick, H
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They are typically injected into a muscle or under the skin and the dose you will be given will ultimately depend on your age, whether you are pregnant or breastfeeding, your diet and if you have any existing medical conditions

Treat the "anti-aging" framing as a hypothesis built on mechanism, not a demonstrated outcome