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Signs and symptoms of vitamin B12 deficiency can include fatigue, pale skin, headaches, shortness of breath, fast heartbeat, gastrointestinal issues, mouth inflammation, paresthesias (abnormal sensations), decreased cognitive ability, depression, muscle weakness, imbalance and incoordination, vision problems, and erectile dysfunction

When your glutathione levels are high, your liver works more efficiently, which means fewer toxins hanging around in your body

[34] Our gut microbiome plays a role in iron uptake and absorption, so compromised gut function can impair iron levels

Some people see flashing lights or feel tingling sensations