Nonoxynol-9 is a detergent spermicide. Frequent use disrupts the epithelium lining the vagina and rectum, and WHO guidance advises against it for people at higher risk of HIV because that damage can increase transmission risk rather than reduce it. It offers no protection against sexually transmitted infections.
Look for instead: A plain lubricant plus a barrier method, and a contraception conversation with a clinician if that is the goal.
At a glance
Role in the formula
Spermicide
Osmolality
Not an osmolality driver
Rating
Commonly advised against — Has a well-documented downside for intimate use; most guidance suggests choosing a formula without it.
Label names to look for
nonoxynol 9, nonoxynol, n 9
Matters more if: sensitive or irritation-prone; trying to conceive.
Care signal
Burning, rawness, or unusual discharge after using a spermicidal product is worth a clinician's review rather than a different brand.
Most guidance suggests choosing a formula without it for intimate use. Nonoxynol-9 is a detergent spermicide. Frequent use disrupts the epithelium lining the vagina and rectum, and WHO guidance advises against it for people at higher risk of HIV because that damage can increase transmission risk rather than reduce it. It offers no protection against sexually transmitted infections.
What does nonoxynol-9 do in the formula?
Its role is spermicide. Has a well-documented downside for intimate use; most guidance suggests choosing a formula without it.
What should I look for instead?
A plain lubricant plus a barrier method, and a contraception conversation with a clinician if that is the goal.
Does the specific product still matter?
Yes. An ingredient list shows what is in a formula, never how much, and two products sharing an ingredient can behave completely differently. The product's own label and instructions always take priority over a general category rating.
Educational information about ingredient categories only — not medical advice, not a product-safety verification, and not a claim that any formula is safe or unsafe for your body. An ingredient list shows what is in a product, never how much. A product's own label and instructions always take priority. Stop and seek care for pain, bleeding, allergic reaction, or worsening symptoms.