foods containing l-glutathione Glutathione to Raise Glutathione Levels – LivOn Labs A Review of Dietary (Phyto)Nutrients
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It can help fade them over time, but it works better as a systemic brightener than a spot treatment

Gervais, V., & Hubert, P

[DOI] [PMC free article] [PubMed] [Google Scholar] Genander M, Frisen J

Two families have been reported with loss of function mutations in PAPPA2 leading to growth impairment with increased concentrations of IGF-I, ALS, IGFBP-3 and IGFBP-5 and a resultant reduction in free IGF-I (180)