A Comparative Analysis of Anti-Aging Pathways
Retinoic acid works by binding to RAR/RXR nuclear receptors. Plant alternatives work on parallel pathways. Bakuchiol, a meroterpene from Psoralea corylifolia, has shown in British Journal of Dermatology (2018) to upregulate collagen I, III, and IV genes (COL1A1, COL3A1, COL4A1) similarly to retinol, without the associated irritation, likely through interaction with the retinoic acid receptors. Rosehip Oil’s efficacy is linked to its tretinoin content and high levels of lycopene and beta-carotene, which are potent quenchers of singlet oxygen, protecting collagen and elastin fibers. Alfalfa (Medicago sativa) contains the phytoestrogen coumestrol, which may support dermal fibroblast function and glycosaminoglycan production. Fruit Enzymes (Bromelain from pineapple, Papain from papaya) are proteolytic enzymes that gently hydrolyze the desmosome proteins (corneodesmosomes) holding dead skin cells together, promoting exfoliation without the pH-dependent action or irritation of AHAs/BHAs.
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