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Description
A deficiency can lead to brittle nails, hair loss, and skin issues

[32] Can injections be self-administered

Neurological symptomsincluding balance problems, confusion, or peripheral neuropathyrequire urgent assessment, as prolonged deficiency can cause irreversible nerve damage

A review of serotonin toxicity data: Implications for the mechanisms of antidepressant drug action

Whatever its origins, zinc deficiency can pose very serious health challenges
