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Red blood cells carry oxygen in the blood, so anemia can cause symptoms such as fatigue or shortness of breath

However, they are not without risks, and potential side effects should be considered

These individuals can receive an injectable form of the vitamin, which altogether bypasses the gastrointestinal tract

The most important column is the last onethere is no evidence from randomized trials in humans that any of these peptides provide the benefits that are advocated

The patient-reported benefit is real but confounded

This does not mean it would be ineffective for every patient but it does raise questions about expectations