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Testosterone is the primary male sex hormone, produced predominantly by the Leydig cells in the testes under the direction of the hypothalamic-pituitary-gonadal (HPG) axis

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Your doctor may prescribe it if you have a documented B-vitamin deficiency or a condition like malabsorption, severe gastrointestinal issues, or after certain surgeries where your bodys demand for B vitamins is higher

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B12 vs B Complex Vitamins: Whats the Difference and Which Do You Need

10.1007/s002490050033 211 GaviolaE