THE KILLER 1.41OZ. Benefits: Meet The Killer, our best-selling boric acid suppository that promotes fresh vaginal odor. Feel confident with our single-ingredient suppository that never includes fragrance or essential oils, two types of ingredients we don't believe belong in women's wellness solutions. Won't disrupt your healthy vaginal pH levels. This odor control must-have is clinically proven as safe for skin. Key Ingredients: Boric Acid: Boric Acid comes from a mineral in sea water and is known for promoting fresh vaginal odor.. Gluten-Free & Dairy-Free. Formulated Without: Fragrance. Essential Oils. Glycerin. SLS, SLES, and PEG. Parabens.