NEW! GGA Watermelon Rind Preserve 250g! Its libido-boosting powers come from the amino acid citrulline, which dilates blood vessels concentrated in the rind. Citruline in watermelon rind preserve lowers blood pressure as well and boosts your workout by increasing oxygen to your muscles! Being a rich source of fiber it helps maintain regular bowel movements, reducing blood sugar levels, and lowering cholesterol.