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As soon as you suspect you suffer from vitamin B12 deficiency, receive vitamin B12 shots and change your diet to mitigate your risk of vitamin B12 deficiency in the future

Clinical enthusiasm is not quality assurance

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(2022) Efficacy and Safety of Human Chorionic Gonadotropin Monotherapy for Men With Hypogonadal Symptoms and Normal Testosterone American Urological Association (2017) Testosterone Replacement Therapy: Is It Right For You

Normal vitamin B12 levels do not change with age, so theres no need to look for a different cutoff as people get older

The capsule format supports convenient laboratory handling, consistent experimental preparation, and extended research workflows