A chemical compound based on methylxanthine–polyphenols lowers nitric oxide levels and increases post-thaw human sperm viability - Volume 25 Issue 6
https://www.cambridge.org/core/journals/zygote/article/chemical-compound-based-on-methylxanthinepolyphenols-lowers-nitric-oxide-levels-and-increases-postthaw-human-sperm-viability/660FFC24DBF57A27F74DBB6E42AA0752