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Common signs may include: Persistent fatigue or low energy Difficulty concentrating Mood changes Weakness or dizziness Tingling in the hands or feet Individuals who follow restrictive diets or have certain digestive conditions may be more likely to experience low vitamin B12 levels

Taking your vitamins

It affects various bodily functions, including: Sperm production Sex drive Muscle strength and size Deepening of the voice during puberty Bone growth and strength Growth of facial, body, and pubic hair during puberty Development of the penis and testes Testosterone may play a role in hair loss later in life

B12's job involves powering up energy systems and helping make DNA while keeping methylation going - a process testosterone needs to be made