“Magnesium is referred to as a natural blood thinning agent due to its potent ability to reduce blood pressure, lower platelet aggregation[22], decrease inflammation, inhibit fibrin formation[23] and moderate calcium when present in higher concentrations. Its vasodilatory actions have been shown to help those with hypertension and may increase the chances of fibrinolysis.[24] While long thought of as purely anticoagulant, research has highlighted magnesium’s role in coagulation as well. Studies suggest that it potentizes coagulant factors, reduces the number of factors required to form a clot and shortens the time it takes.[25] This is likely to prevent excessive clotting and make coagulation more efficient. When coupled with any of the above supplements, large-dose magnesium has the potential to increase the risk of bleeding in patients on blood-thinning medications.”

https://myacare.com/blog/10-supplements-that-can-affect-blood-clotting#:~:text=Magnesium%20is%20referred,blood%2Dthinning%20medications.