Local and session storage
When you load a page, our tracker creates two random identifiers and stores them in your browser:
pd_vid— a visitor identifier, kept in local storage so returning visits from the same browser can be counted (anonymously) as one visitor.pd_sid— a session identifier, kept in session storage so views within a single tab are grouped, and cleared when the tab closes.
These are random UUIDs. They contain no personal information, they never leave your browser except as part of an anonymous page-view count, and they are never sent to a third party. They are not cookies.
What we do not use
- No advertising or retargeting cookies.
- No third-party analytics (no Google Analytics, no Meta Pixel, no similar).
- No social-media embeds that set cookies.
- No cookie consent banner — because we set no cookies that would require one.
Managing storage
You can clear local and session storage at any time through your browser settings (for example, DevTools → Application → Storage). Clearing it simply gives you a new anonymous visitor identifier on your next visit; it does not affect your ability to read the site.
Research use only
This site is a research reference. The compounds covered are not licensed for human consumption in the UK, and nothing here is medical advice. See our terms of use and privacy policy.