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Essex et al

Feb 15;7(2):20

If you currently have a 5mg vial mixed with 1mL and you want to switch to 2.5mg/mL, you would mix your next 5mg vial with 2mL instead

Despite these promising findings, a subsequent randomized, double-blind, controlled trial testing NAC administered subcutaneously at 50 mg/kg per day for 12 months in ALS patients failed to change the disease progression parameters, including a decline in muscle strength, pulmonary and bulbar function, disability, and survival rate when compared to the placebo patient group [106]

So citric acid is an exfoliant , that can - just like other AHAs - gently lift off the dead skin cells of your skin and make it more smooth and fresh