- All it takes is just a drop of saliva
KNOWHEN® harnesses a remarkable natural phenomenon that occurs in every woman’s body during her fertile period. When estrogen levels rise during the fertile phase, they trigger an increase in the salt content of saliva. This biological change creates something extraordinary under microscopic observation: distinct crystallization patterns known as “ferning.”
Test daily, including during menstruation, to track consistent patterns over time. It’s important to maintain daily testing for several months to gain reliable insights. Limit testing to once per day to avoid conflicting results and ensure accuracy.
Our woman-led engineering team has transformed this laboratory science into an accessible home testing solution. The KNOWHEN® device combine
These crystalline formations, which resemble delicate fern leaves, aren’t just beautiful—they’re a scientifically validated indicator of fertility. Medical researchers have extensively documented how these patterns become more pronounced as fertility levels increase, providing a clear, visual window into your body’s natural cycle.
The KNOWHEN® Ovulation Test tracks your ovulation using only a drop of your saliva. It identifies your five (5) most fertile days and the best days in your ovulation cycle if you’re trying to conceive.