glutathione and hormones 15 Benefits: How to Improve Your Mind & Body Exploring the Safety and Efficacy

Intramuscular injections Intramuscular shotsneedles that go deep into the muscle tissuewere believed to be superior because the medication can be absorbed into the bloodstream more quickly, due to muscle fibers having a greater blood supply than the tissue under your skin

Sources MedlinePlus

Nackapan, If I understand correctly, you're saying that because a return of symptoms is experienced in a fairly short span of time without injections, this proves that someone with PA cannot utilize their stores of B12

Some studies indicate that omega-3s can support memory and overall brain health

Your body regulates this tightly