A: Repeated freeze-thaw cycles can cause peptide degradation and loss of bioactivity
And there is even more regarding SAP and acne
TB500: Cellular Migration and Tissue Remodeling TB500 is a synthetic form of thymosin beta-4 , a peptide involved in cellular movement and repair processes
Studies say that the total amount of Zinc in all body fluids and tissues has been recorded to almost 60%

N-Acetyl-L-Cysteine (NAC) by Designs for Health provides 900 mg per capsule of this powerful amino acid precursor to glutathione the body's master antioxidant.* It supports healthy liver function, optimal detoxification, antioxidant status, muscle recovery, lung health, and brain function.* N-Acetyl-L-Cysteine is formulated to support healthy liver function and normal detoxification by promoting glutathione production.* Glutathione is the body's primary antioxidant for neutralizing free radicals and clearing unwanted compounds.* Individual results may vary based on diet, lifestyle, and overall health status.* Key benefits include support for normal glutathione status, healthy liver function, optimal detoxification, antioxidant status, muscle function and recovery, and brain and lung health.* These benefits stem from NAC's role as the rate-limiting precursor to the body's glutathione production.* Take one capsule per day, or as directed by your healthcare practitioner

Rossignol DA, Bradstreet JJ