It is not targeting a single symptom but rather restoring the underlying cellular machinery
Malabsorption (insufficient intake of vitamin B12in the intestine) due to insufficient production of intrinsic factor (a protein that is formed in the gastric mucosa and is required for the absorption of vitamin B12), Diseases in the end section of the ileum (part of the small intestine), e.g

(Blue-tinged skin, resulting from inadequate oxygen levels in the blood, is a hallmark symptom of methemoglobinemia, so it's somewhat ironic that the treatment itself is a shocking blue color.) But the short-term use of a pharmaceutical-grade product in a controlled setting under the supervision of a skilled medical provider is different than buying an unregulated supplement off the internet and taking it every day because you've heard that it will give you loads of energy by "enhancing mitochondrial efficiency." In light of the increased attention being paid to the inky liquid, it makes sense to learn a bit about methylene blue's history, how it works, and whether its various health claims stand up to closer scrutiny
This gets much worse with age, as the accumulation of toxins and cumulative damage of oxidative stress take their toll on the body
dietary sources include oily fish, dairy, eggs, and mushrooms