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Can Type O's ingest too much zinc?
Sure. Anyone can ingest too much zinc. This can be a problem when taking a multitude of different supplements, all containing "safe" amounts of zinc, but which together amount to a toxic dose. In general, one should avoid taking more than 15 mg daily unless under the supervision of a trained professional. Zinc has very paradoxical effects in the body: small amounts over a short period of time enhance immunity, whereas larger amounts over longer periods suppress immunity.