glutathione cell culture medium Quantification in Live Cells with Real-Time Imaging and Flow Cytometry: STAR Protocols These provide antioxidant and cell Glutathione reduced
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The most reported adverse events were gastrointestinal in nature, were largely mild to moderate and tended to diminish over time

[DOI] [PubMed] [Google Scholar] 337.Alamro A.A., Alsulami E.A., Almutlaq M., Alghamedi A., Alokail M., Haq S.H

MSCs, derived from bone marrow, adipose tissue, or umbilical cord, placenta, or periodontal ligament, exert their effects predominantly through paracrine mechanisms and EVs

If you want a capsule form, a person can buy empty gelatin capsules and fill the powder himself and save big bucks
