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Whilst vitamin B12 toxicity is exceptionally rare due to its water-soluble nature, very high levelsparticularly from mega-dose supplements or frequent injectionshave been associated with certain adverse effects, most notably skin reactions

doi:10.1186/gb-2002-3-3-reviews3004

A study published in the European Journal of Clinical Nutrition highlighted the superior bioavailability of IV-administered glutathione compared to its oral counterpart

Watch-outs to know: Some researchers have discussed concerns that repeatedly stimulating reproductive hormones could create long-term health consequences

Apply a small amount to the inside of your elbow and wait 24 hours