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And to do that all of the other delivery methods that could be used need to be thoroughly evaluated, not only as to their effectiveness in correcting the patients B12 Deficiency, but also in how the patient responds to particular delivery methods

Additionally, a 2020 observational study published in the Journal of Dermatology and Dermatologic Surgery identified correlations between periorbital hyperpigmentation (dark circles under the eyes) and low serum ferritin levels an early indicator of iron deficiency

Conditions such as malnutrition, alcoholism, certain medical conditions (e.g., Crohns disease, celiac disease), or restrictive diets (e.g., veganism without adequate supplementation for *B12*) can lead to deficiencies in one or more of these crucial vitamins
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Im not calling anyone a liar I just havent been able to find any papers that the decisions to change the treatment was based on