Privacy Policy

Effective date: January 23, 2026

Productist LLC, operating fatscientist.com ("Site"), is committed to protecting your privacy. This privacy policy outlines what information we collect, how it is used, and your choices regarding this information.

Information We Collect

Email Addresses

When you voluntarily sign up for updates or our newsletter, we collect and store your email address through our third-party email service provider, Resend. This information includes:

Your email address
The source of your subscription (e.g., which page you signed up from)
Date and time of subscription

We use this information solely to send you updates, newsletters, and information related to GLP-1 medications and our calculator tools. You can unsubscribe at any time using the link provided in every email.

Usage and Analytics Data

We collect anonymous usage data through two analytics services to improve our Site and user experience:

Google Analytics 4: Tracks page views, navigation patterns, and general site usage.
PostHog: Tracks page views, user interactions, and feature usage patterns.

This analytics data includes:

Pages viewed and navigation paths
Calculator usage (dosage inputs, concentrations, and calculation results)
Quiz interactions (quiz starts, completions, scores)
Disclaimer interactions (views and acceptances)
Browser type, device type, and screen resolution
Referring website or search terms
Approximate geographic location (country/city level for Google Analytics only; PostHog does not collect geolocation)

Important note on IP addresses: Neither analytics service stores your IP address. Google Analytics uses IP addresses momentarily to determine approximate geographic location (city/country), then immediately discards them. PostHog discards IP addresses entirely without collecting any geolocation data.

Important note on health data: While calculator inputs may include health-related information such as medication dosages, this data is collected anonymously for product improvement purposes. We do not use this information to identify individual users or create personal health profiles.

Local Storage Data

Our calculator tools save your inputs locally in your browser's localStorage. This data remains on your device and is never transmitted to our servers. It is used solely to preserve your calculator settings between visits for your convenience. You can clear this data at any time by clearing your browser's local storage or cache.

Cookies and Tracking Technologies

We use cookies and similar tracking technologies through our analytics services (Google Analytics and PostHog). These cookies help us:

Understand how visitors use our Site
Distinguish between unique visitors
Remember your preferences
Improve site performance and user experience

You can configure your browser to refuse cookies or alert you when cookies are being sent. However, some features of the Site may not function properly without cookies.

Cookie consent for EU/EEA visitors: For visitors from the European Union and European Economic Area, we display a consent banner before analytics cookies are set, allowing you to accept or decline non-essential cookies. We may still receive anonymous, cookieless measurement data via Google Analytics consent mode until you opt in.

How We Use Your Information

We use collected information for the following purposes:

Email communications: To send newsletters, updates, and information about GLP-1 medications and our tools (only if you've subscribed)
Product improvement: To understand which calculators are most used and how to improve their accuracy and usability
Site optimization: To identify technical issues, improve page load times, and enhance user experience
Content development: To understand what information users need most and develop relevant educational content

Third-Party Services

We use the following third-party services that may collect information:

Google Analytics 4

Web analytics service provided by Google LLC (United States). Google Analytics collects:

Page views, navigation patterns, and calculator usage patterns
Device and browser information (browser type, operating system, screen resolution)
Approximate geographic location (city/country level, derived momentarily from IP address which is then discarded)

Configuration details:

IP addresses: Not stored (used momentarily for geo-location, then immediately discarded)
Google Signals: Enabled for cross-device reporting
Ads personalization: Enabled for the region
User-ID collection: Disabled (we do not send personally identifiable information to Google)
Opt-out: Install the Google Analytics Opt-out Browser Add-on
Privacy Policy: Google Privacy Policy

PostHog

Product analytics platform (United States) for understanding user behavior. PostHog collects:

Device and browser metadata (browser type, operating system, screen dimensions, language)
Usage behavior (pages visited, referrals, calculator interactions, button clicks)
Anonymous session data (tied to a random cookie identifier, not to any identifiable person)

Configuration details:

IP addresses: Discarded, not collected
Geolocation: Not collected
Opt-out: Honors "Do Not Track" browser setting
Privacy Policy: PostHog Privacy Policy

Resend

Email service provider (United States) for managing newsletter subscriptions and communications. Resend collects:

Email address
Subscription source (which page you signed up from)
Timestamp of subscription

Data Retention

We retain different types of data for varying periods:

Email addresses: Retained until you unsubscribe or request deletion
Google Analytics data: Event-level data retained for 2 months; user-level data retained for 14 months
PostHog data: Retained for 7 years
Local storage data: Persists in your browser until you clear it manually

Your Privacy Rights

You have the following rights regarding your personal information:

Right to access: Request a copy of the personal information we hold about you
Right to deletion: Request deletion of your email address from our mailing list
Right to opt-out: Unsubscribe from email communications at any time
Right to opt-out of analytics: Use browser privacy settings, ad blockers, or opt-out tools provided by Google and PostHog

To exercise these rights, contact us at productist@fastmail.com.

General Analytics Opt-Out Options

In addition to the service-specific opt-out options listed in the Third-Party Services section above, you can also:

Enable "Do Not Track" in your browser settings
Use browser privacy features or extensions that block tracking cookies
Disable JavaScript (note: this may break calculator functionality)

Data Security

We implement reasonable security measures to protect your information. However, no method of transmission over the internet or electronic storage is 100% secure. While we strive to protect your personal information, we cannot guarantee absolute security.

Children's Privacy

Our Site is not intended for individuals under the age of 18. We do not knowingly collect personal information from children. If you believe we have collected information from a child, please contact us immediately.

California Privacy Rights (CCPA)

If you are a California resident, you have additional rights under the California Consumer Privacy Act:

Right to know what personal information is collected, used, shared, or sold
Right to delete personal information held by businesses
Right to opt-out of sale of personal information (note: we do not sell personal information)
Right to non-discrimination for exercising your CCPA rights

California Shine the Light Law: We do not share personal information with third parties for their direct marketing purposes.

European Privacy Rights (GDPR)

If you are located in the European Economic Area (EEA), you have additional rights under the GDPR:

Right to data portability
Right to restrict processing
Right to object to processing
Right to lodge a complaint with a supervisory authority

Our legal basis for processing your data is consent (for email subscriptions) and legitimate interests (for analytics to improve our service).

Changes to This Policy

We reserve the right to modify this privacy policy at any time. Changes will be posted on this page with an updated effective date. We encourage you to review this policy periodically. Continued use of the Site after changes constitutes acceptance of the updated policy.

Contact

If you have any questions about this privacy policy or wish to exercise your privacy rights, please contact:

Productist LLC
productist@fastmail.com