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Hormone context

Endocrine disruptors: what the research says and what an app cannot tell you.

daygauge does not measure chemical exposure or hormones. It cannot infer hormones, fertility, pregnancy or exposure dose.

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The question

Start with what your own data can show.

BPA, PFAS and phthalates are often discussed alongside fertility, testosterone and cycles, and the topic can feel urgent.

An app cannot see any of this. Chemical exposure and hormone levels need specialist testing and a clinician. They do not show up in sleep, movement or heart readings.

Quick answer

daygauge does not measure endocrine disruptors or hormones. You can add a custom habit in Quick Log, such as a product change you are trying, and see it next to your sleep, movement and heart readings.

Questions answered

What this guide covers.

  • What are endocrine disruptors?
  • Can apps track endocrine disruptor exposure?
  • Can lifestyle data infer hormones?
  • How should cycle context be handled?
  • Which claims should you distrust?
In daygauge

How the app handles this.

Signal
Cycle tracking is optional and free. It shows period days for context and does not change your Life Index.
Confidence
Missing readings lower confidence instead of creating false certainty.When a reading is not available, daygauge says so rather than filling the gap.
Weekly Review
Weekly Review shows what changed, what moved with it and whether the pattern repeated.Your first Weekly Review is free. Later reviews are part of Pro.
Illustrative example

What this can look like in the app.

Custom habit: fragrance-free product trial, logged on 6 of 7 days. No hormone reading is implied.

Example
Confidence

Confidence rises when the same pattern repeats against your own baseline and drops when key signals are missing.

Next move

Try one small change, log it, then see whether the pattern repeats over the next week.

Example 1

Cycle tracking: switched on by you and shown as period days for context. It does not change your Life Index.

Example 2

Boundary: daygauge does not predict fertility, detect hormone imbalance or infer pregnancy.

Research

Further reading.

These studies describe groups of people. They help explain the topic, but they cannot tell you what will happen to you.

Research context only. daygauge does not diagnose, treat, prevent or predict disease risk. Personal medical concerns belong with a qualified clinician.

Limits

What daygauge does not do.

  • It does not diagnose, treat or prevent disease, or predict your risk of it.
  • It does not claim one habit caused a result. It shows the pattern, how confident it is and what else changed.
Read next

Related guides.

Hair changes need a timeline, not a premature cause labelMicroplastics are not part of the Life IndexPFAS is a topic to understand, not a number an app can give youCycle tracking is opt-in, private and freeprivacy
On the App Store

Want to log a habit next to your own sleep and movement?

daygauge is free to download. Pro is £8.99 a month or £49.99 a year.

Download on the App Store

Personal analytics, not medical advice