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The reason this substance is still available to purchase in the US is the labs, pharmacies, and companies selling the products claim the substance is available for purchase for research only

Yu R, Zuo T, Diao P, Fu J, Fan Y, Wang Y, Zhao Q, Ma X, Lu W, Li A, Wang R, Yan F, Pu L, Niu Y, Wuriyanghan H (2021) Melatonin enhances seed germination and seedling growth of Medicago sativa under salinity via a putative melatonin receptor MsPMTR1

The mechanisms by which flavonoids deactivate ROS involve electron transfer and/or the transfer of hydrogen atoms to hydroxyl, peroxyl, or radical groups of different origins, leaving behind resonance-stabilized flavonoid radicals with low reactivity

A critical pharmacological hurdle lies in achieving tumor-selective delivery: systemic administration of STING agonist-loaded nanoparticles activates STING not only in tumors but also in plasma and major organs (spleen, liver, lungs, kidneys) [91]