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While it may not become harmful after its expiration date, its effectiveness can diminish significantly

University of Waterloo
Determination of biothiols by bromobimane labeling and high-performance liquid chromatography

(PubMed) Perrine CG, Herrick KA, Gupta PM, Caldwell KL

If you take vitamin B12 supplements, let your doctor know so they can tell you how much you need, and make sure they won't affect any medicines you're taking

Zinc possesses anti-inflammatory properties that can help reduce swelling, redness, and pain associated with tissue damage