but b12 injections at Olympia B12 Shots: Benefits, Uses, Safety,

Inadequate levels of vitamin B complex can lead to weakened muscles, sluggish reflexes, or trembling sensations

Poor vitamin B 12 status has been linked to increased risk of breast cancer in some, but not all, observational studies

Cox, JE

In skin applications, this manifests as increased aging signs

These may include: Nausea and stomach upset Diarrhea Constipation Injection site redness or swelling Itching Headache Dizziness Blood clots Swelling In rare cases, some people may experience an allergic reaction to vitamin B12, which can cause symptoms such as hives, difficulty breathing, and swelling of the face, lips, tongue, or throat