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Also, some medical treatments, like chemotherapy or radiation, can also lower testosterone levels

(What the Evidence Shows) Short answer: not on their own

Typically, intramuscular treatment for dietary vitamin B12 deficiency begins with a loading dose followed by maintenance therapy, contrasting with the steady daily doses used in oral treatment due to limited passive absorption

Vitamin D3 helps maintain good health and has been shown to be beneficial in helping to: support bone health, prevent fractures, help with back pain, regulate hormones and alleviate some symptoms of depression

The single best reason to take a vitamin B12 supplement is to prevent vitamin B12 deficiency which can lead to a number of symptoms and even long-term health issues, such as chronic fatigue, mood disorders, neurodegenerative disorders, heart issues, anemia and neural tube defects in infants