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In addition to supplementation, dietary and lifestyle modifications can also help enhance sperm antioxidant defenses

Therefore the overall impact on fertility that ROS has is not a matter of if it is there or not (as mentioned earlier, some oxidative stress is required for various reproductive physiological functions), but when levels of ROS are too high (or antioxidant levels are too low) it becomes pathological to sperm and the ability to get pregnant

This is a critical distinction

For these reasons, peptides should always be used under the supervision of a qualified physician who can evaluate medical history, order appropriate labs, discuss realistic expectations, and monitor for benefits and adverse effects

doi: 10.3390/ijms21010360 97 TianZ-FHuR-YWangZWangY-JLiW

Formation of pentosidine during nonenzymatic browning of proteins by glucose