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[7] Administration therefore restores physiologic androgen levels, suppresses hypothalamic gonadotropin-releasing hormone and pituitary luteinizing hormone, stabilizes nitrogen balance, increases lean body mass and may improve mood and sexual function, yet prolonged suppression of intratesticular testosterone can reduce spermatogenesis, underscoring the need for careful dose titration and fertility counseling when indicated

It's not the B12 causing the gain, but the lack of B12 impairing your body's ability to maintain its usual energy output

Volume per dose: How many milliliters to draw for your target dose

However, check with your healthcare provider for accuracy