Effects of phytocannabinoids on mRNA levels of genes involved in extracellular matrix maintenance in CCD-1064Sk human dermal fibroblasts. mRNA levels were presented as a ratio of the target gene relative to GAPDH for expression of (A) COL1A1, (B) COL3A1, (C) ELN, (D) HAS1, (E) MMP1, (F) MMP2, and (G) TIMP1. Data were analyzed with an ANOVA test followed by a Dunnett’s post-hoc multiple comparison test compared to the vehicle. Bars represent mean ± SEM, n = 3. Significance is indicated using the following scale: * p < 0.05, ** p < 0.01, *** p < 0.001. CBD, cannabidiol; DMSO, dimethyl sulfoxide (vehicle); THC, delta-9-tetrahydrocannabinol.