A reader ask me about this and a quick browse found that it definitely warrants a post because it is off the usual beaten path for both conventional and alternative medicine. It’s a herb that you may wish to season your meals with. It has a nice profile.
” Anti-inflammatory, antioxidant, immunomodulatory, and anti-apoptotic activities of Sumac(RC) are especially due to its phenolic compounds. In this study, the anti-inflammatory, antioxidant, immunomodulatory, and anti-apoptotic activities of RC were demonstrated in a rat NEC model. RC can suggest as a new treatment option for preventing intestinal injury. ” 
” Gallic acid was determined as the primary phenolic acid in the extracts of R. coriaria, followed by cyanidin, peonidin, pelargonidin, petunidin, delphinidin glucosides and coumarates. R. coriaria also contains some organic acids including malic acid, citric acid, tartaric acid and fumaric acid ” 
The ethanol extract of the fruit of the genetically related Rhus coriaria L., known as sumac, afforded protocatechuic acid, isoquercitrin, and myricetin-3-O-α-L-rhamnoside from the fruits for the first time, in addition to the previously reported phenol acids and flavonoids, gallic acid, methyl gallate, kaempferol, and quercetin. 
- In vitro evidences of the traditional use of Rhus coriaria L. fruits against skin inflammatory conditions.
- Reduction of expression of IL-18, IL-1β genes in the articular joint by sumac fruit extract (Rhus coriaria L.). ]2019]
- Neuroprotective and Anti-Inflammatory Effects of Rhus coriaria Extract in a Mouse Model of Ischemic Optic Neuropathy.  ” The results of this study provide strong scientific evidence for the neuroprotective activity “
- Efficacy of Rhus coriaria (sumac) juice in reducing muscle pain during aerobic exercise. 
- Lipid-lowering effect of Rhus coriaria L. (sumac) fruit extract in hypercholesterolemic rats. 
- New antifungal xanthones from the seeds of Rhus coriaria L. 
- Anti-ischemic activity and endothelium-dependent vasorelaxant effect of hydrolysable tannins from the leaves of Rhus coriaria (Sumac) in isolated rabbit heart and thoracic aorta. 
- DNA-protective effects of sumach (Rhus coriaria L.), a common spice: results of human and animal studies. 
Reported in Studies to reduce the following