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doi:10.1146/annurev.nutr.19.1.357

Common Deficiency Symptoms Common symptoms of Vitamin B12 deficiency include: Fatigue Weakness Pale skin Shortness Mouth Issues: Sore, red tongue, mouth ulcers, bleeding gums Gastrointestinal: Loss of appetite, weight loss, nausea, diarrhea, constipation Nerve issues like numbness/tingling Mood changes (depression, irritability) Memory problems Key Differences: NAD+ vs B12 NAD+ and B12 both boost energy, but NAD+ acts as a deep cellular, anti-aging repair agent, while B12 provides immediate metabolic energy and red blood cell support

However, due to lifestyle factors such as limited sun exposure and dietary insufficiencies, many individuals experience Vitamin D deficiency, which can manifest as fatigue, depression, and weakened immune response

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