L-Citrulline

L-Citrulline is an amino acid found in watermelon. The body turns it into arginine, which is used to make nitric oxide, a molecule that relaxes blood vessels.

Small studies have used amounts around 1.5g a day, with one finding better erection hardness at that dose, while cycling studies have used up to 2.4g/day, and typical research ranges run 3-6g/day.

HorseFil's amount is not published, so we can't confirm whether the gummy's share of L-Citrulline approaches these research levels.