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In one ED-focused study, inadequate B12 levels were reported in some participants, and deficiency can cause symptoms like fatigue, nerve issues, and mood changes that may indirectly undermine sexual performance

Sarzi-Puttini P, Giorgi V, Atzeni F, Roberto G, Kosek E, Choy E, Bazzichi L, Huser W, Ablin J, Aloush V, Buskila D, Amital H, Da Silva J, Perrot S, Morlion B, Polati E, Schweiger V, Coaccioli S, Varrassi G, Batticciotto A

Low B12s effect on blood is a specific type of anemia called megaloblastic anemia (as distinct from the more common iron deficiency anemia)

These claims have yet to be evaluated in humans and there is no research showing that it has this effect in test subjects