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Increased red blood cells enhance the oxygen carrying capacity of the blood therefore supporting aerobic performance

However, for that to work, it means you will have to put in the effort to get every ounce of benefit from this treatment as you can

[5] A 2018 study found that in women with persistent symptoms of hypothyroidism despite levothyroxine therapy, two-thirds were able to eliminate their symptoms when they got their ferritin levels over 100 g/l

23 Supplementation of 1 mg daily is recommended for patients with specific risk factors (e.g., bariatric/gastric surgery patients, those with severe malnutrition, chronic alcohol use, chronic hemolytic anemia and conditions with high cell turnover, and use of antimetabolite medications such as methotrexate)