how long does it take a b12 injection to work Shots at Home: How, Where & Often Inject Yourself B12 Injections for Weight Loss:

Potential Discomfort: Some people experience mild pain, redness, or swelling at the injection site

150 Other Antioxidants & Multi-nutrient Formulas Oxidative damage to hair cells and other auditory tissues is thought to be an important contributing mechanism in tinnitus, and many therapies shown to be beneficial have antioxidant properties

Further, NICE and the BNF says that if there are neurological symptoms present, then every other day injections are the recommended treatment, so all the points you make about B12 being stored and sufficient are not really relevant

Once administered, ALA injections are quickly absorbed and distributed throughout the major organs

If this occurs, the symptoms are typically temporary and should resolve within a day or two