liposomal glutathione clinical trials benefits outperforms plain glutathione in uptake, cell regeneration and systemic availability: evidence from cellular and human models | British Journal of Nutrition Oral supplementation with liposomal glutathione

B12 deficiency is a widespread condition

It actually targets discolouration, which is why you see it in many skin-lightening products

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[24] Cyanocobalamin is one of the most widely manufactured vitamers in the vitamin B 12 family (the family of chemicals that function as B 12 when put into the body), because cyanocobalamin is the most air-stable of the B 12 forms, [25] and is the easiest to purify after it is produced by bacterial fermentation

AMERICAS GLUTATHIONE MARKET SIZE, BY NUTRACEUTICAL, 2018-2032 (USD MILLION) TABLE 211