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doi: 10.3233/JAD-130101

Currently there is no established upper limit for B12 due to the low potential for toxicity

Last reviewed: June 20, 2026 Last updated: June 20, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

If a BPI is suspected, there will often be a period of observation to see if the nerve is likely to recover on its own without surgery

In short, we demonstrated that oral administration of L-glutathione prior to UVB irradiation could influence the cutaneous response