For male fertility , the evidence is especially strong
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PMID 11071707
In vitro and animal studies have found that lipoic acid exhibits immunomodulatory properties through mechanisms that stimulate the production of cyclic AMP (cAMP) (90, 91) a central regulator of innate immune functions and inhibits the migration of immune cells into the brain and spinal cord (92), possibly by decreasing endothelial expression of cell adhesion molecules, inhibiting expression of enzymes like matrix metalloproteinases (MMP), and/or reducing the permeability of the blood-brain barrier (87, 89, 93, 94)
ROS can also disturb protein folding within the ER lumen by altering the redox balance of disulfide bond formation, further activating the unfolded protein response (UPR) via PERK, IRE1, and ATF6 sensors (76)