Melasma primarily affects the face and occurs symmetrically on the cheeks, bridge of the nose, forehead, chin, and above the upper lip
"Older adults, those with digestive issues or people on certain medications may also struggle to absorb enough from food." If you don't fall into one of these categories, your doctor can order lab tests to help determine your vitamin B12 status
In online forums, people have credited the peptide with boosting energy and curbing pain
Cheng, F., Wang, Q., Chen, M., Quiocho, F
For a healthy person eating meat, dairy or fortified plant foods, the NHS view is that you do not need B12 injections
25 Castelli MC, Friedman K, Sherry J et al (2011) Comparing the efficacy and tolerability of a new daily oral vitamin B12 formulation and intermittent intramuscular vitamin B12 in normalizing low cobalamin levels: a randomized, open-label, parallel-group study