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Maintenance Therapy : For ongoing maintenance, a monthly injection of 1 mg (1000 g) is generally sufficient to maintain adequate vitamin B12 levels in most adults

Manning et al

Foods that contain high levels of methionine include cheese, eggs, fish, meats, spinach, potatoes, Brazil nuts, sesame seeds, and select other plant seeds

PMC 4189588

Also Read: How To Increase Platelet Count Naturally Conclusion Maintaining balanced vitamin B12 levels is essential for overall health and functions, such as supporting red blood cell production, nerve function, and energy metabolism

Regular injections or supplements might be necessary to maintain adequate levels