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"Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms"

Vitamins B12 and D deficiencies and macro- and microelement disturbances among diabetic elderly patients

(2009), Comparative Efficacy of Nonpurpuragenic Pulsed Dye Laser and Intense Pulsed Light for Erythematotelangiectatic Rosacea

So, because its not actually required, a lot of companies will forego quality testingmeaning theres no way to know if youre actually getting what youre paying for
