Categories
Two levels, deliberately. The top level says what kind of question you have; the subcategory decides who reads it. Every subcategory has its own moderators, its own tag set, and a pinned About this category wiki post describing what belongs there.
Start Here
Orientation for new members: how this community works, how to ask a question that gets a good answer, and where to find the maintained documentation before you post.
60 topics · 2,911 posts · 30 solved · last activity just now
Compounds
One subcategory per compound family. Pharmacology, published data, practical experience, and the maintained reference page for each.
207 topics · 10,207 posts · 73 solved · last activity just now
Practice
The practical mechanics: arithmetic, preparation, handling, administration, and managing what goes wrong.
194 topics · 10,175 posts · 48 solved · last activity just now
Analytics
Analytical chemistry: chromatography, mass spectrometry, certificates of analysis, impurity profiles and method validation. The most technical part of the site.
178 topics · 8,388 posts · 59 solved · last activity 1h
Evidence
Published evidence, read closely. Trial digests, journal club, meta-analyses, preprints, and structured critique.
148 topics · 7,629 posts · 42 solved · last activity just now
Sourcing
Supplier documentation, independent verification, red flags, logistics, payments and the regulatory picture. Maintained as documentation, not as recommendations.
140 topics · 6,877 posts · 43 solved · last activity 4h
Clinical
Laboratory interpretation, comorbidities, special populations, and preparing for a conversation with your own prescriber. General information only.
96 topics · 4,480 posts · 30 solved · last activity just now
Access
Coverage, cost, availability and geography — the practical barriers between a person and a legitimate supply.
70 topics · 3,894 posts · 18 solved · last activity 1h
Outcomes
What actually happened, reported with measurement caveats: progress reports, body composition, and long-term maintenance.
34 topics · 1,712 posts · 11 solved · last activity 9h
Nutrition & Training
Protein adequacy, resistance training, and hydration during a substantial energy deficit.
42 topics · 2,237 posts · 8 solved · last activity 12h
Wellbeing
Mental health, sleep, and the psychological side of a large change in appetite and body size.
28 topics · 1,444 posts · 9 solved · last activity 3h
Pharmacology
Receptor biology, pharmacokinetics and formulation chemistry — the mechanistic layer under everything else.
50 topics · 2,108 posts · 5 solved · last activity just now
Devices
Syringes, needles, pens and the cold chain — the hardware questions.
48 topics · 2,155 posts · 14 solved · last activity just now
Data & Tools
The calculators maintained on this site, plus the arithmetic behind them and the bug reports that improve them.
30 topics · 1,526 posts · 14 solved · last activity 1h
Documentation
The documentation commons itself: requests, drafts, review, citation checking, and promotion of topics to maintained pages.
30 topics · 1,617 posts · 8 solved · last activity 12h
Regional
Geography-specific practicalities, kept separate so that country-specific answers do not get generalised.
38 topics · 1,713 posts · 8 solved · last activity 10h
Research Methods
How to reason from data: self-experiments, statistics, bias and confounding.
30 topics · 1,295 posts · 9 solved · last activity 6h
Safety
Adverse events, contraindications, and escalation. If something is urgent, this category tells you to stop reading and get help.
30 topics · 995 posts · 7 solved · last activity 1h
Meta
The community about itself: feedback, governance, wiki maintenance, announcements and feature requests. Moderation decisions are discussed here and logged publicly.
56 topics · 2,688 posts · 14 solved · last activity 2h
Lounge
Lower-stakes conversation. Still civil, still sourced when a claim is made, but the bar for relevance is lower.
26 topics · 1,114 posts · 2 solved · last activity 1h