The Science: What Makes our Birth Control Credible?

Credibility is one of our Four Core Values here at Natural Cycles. Read more about our research, the medical advisors who work with us, and our certifications.

Scientific research at Natural Cycles

Natural Cycles is shown to have an effectiveness rate of 93% with typical use and 98% effective with perfect use. This analysis looked at the data of over 15,000 women. When calculating typical effectiveness in this study, all possible reasons for becoming pregnant while using Natural Cycles were taken into account, this included having unprotected sex on a red day, to the app wrongly giving a green day, or the failure of a barrier method.

As part of our mission to pioneer women’s health with research and passion, we have a dedicated in-house team committed to research.  View our published studies on Natural Cycles’ effectiveness via the links below:


Contraception
The European Journal of Contraception and Reproductive Care

What is perfect use?

  • Perfect use is when you do not have unprotected sex on red days, i.e. always use a condom or abstain from sex
  • To be a perfect user, you do not need to measure every day at the same time, but you do need to use protection on every red day
  • Perfect use also includes women who had unprotected sex on a green day that was falsely given, or had protected sex on a red day but the method failed (e.g. a broken condom)
  • 98% effective means that 2 women out of 100 will get pregnant during 1 year of use, even with using the app perfectly

What is typical use?

  • Typical use shows how many women on average get pregnant due to all possible reasons
  • The most common reason for pregnancy with Natural Cycles is the failure to use protection on red days
  • Typical use includes pregnancies that occurred under perfect use
  • 93% effective under typical use means that 7 out of 100 women will get pregnant during one year of use

Effectiveness table

Check out the effectiveness for different birth control methods.

Birth Control
Method
Natural Cycles
Pill
Male Condom
IUD
Nuvaring
Fertility Awareness
Withdrawal Method
*Typical
use %
93%
93%
87%
>99%
93%
77-98%
80%
*Perfect
use %
98%
>99%
98%
>99%
>99%
95-99%
96%

*Percentage of typical/perfect users who did not get pregnant with the method over 1 year of use.

Reference: Contraceptive Technology (Table 26 - 1). 21st Edition, 2018 —>
Source: Trussell J . Contraceptive Efficacy. In Hatcher R A, Trussell J, Nelson A L , Cates W, Kowal D, Policar M. Contraceptive Techology: New York NY: Ardent Media, 2018—>

Advisors

Dr. Helena Kopp Kallner

PhD. M.D.

A Senior Consultant in Obstetrics and Gynaecology at Danderyd Hospital and researcher at the Karolinska Institute, Dr Kopp Kallner is secretary of the Board of the Swedish Society of Obstetricians and Gynecologist. She is also a member of the Advisory Board of Natural Cycles. Dr Kopp Kalner works with Natural Cycle in designing and performing new research on fertility monitoring, contraception and mHealth.

FDA Cleared

In 2018 the US Food and Drug Administration (FDA) cleared Natural Cycles for use as a digital method of birth control.

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Certified in Europe

In Europe, Natural Cycles is the first CE-marked Class II medical device (CE0123) for use as a method of birth control.

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Quality Regulated

We are ISO13485 certified, working to the highest level of safety and quality, with a quality management system at our core.

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