Most of what you read about peptides is about who they might help. This page is the opposite: who should not use them at all, and who needs a proper conversation first. If more of the industry published this list, fewer people would need it.
If any of these apply, peptides are off the table. Not "be careful". Off the table.
These are not automatic no-gos, but they are not DIY territory either. They change which compounds are suitable, at what level, with what monitoring.
The certification our practice is built on teaches a simple structure, and it is the one we actually run:
Before anything: full history and baseline blood work. This is where the list above gets checked, honestly.
Weeks 2 to 4: early review. Tolerance, adjustment, anything unexpected.
Weeks 6 to 12: proper follow-up against the baseline numbers.
Always: a clear reason to stop. If something is off, it stops.
If someone will hand you a vial without asking a single question about your health history, that tells you everything about how the rest of their operation runs.
Source: the ISSCA Advanced Peptide Therapy Certification (physician-built and delivered), clinical safety module, held by our founder. See The Credentials. These contraindications align with standard clinical guidance for the equivalent licensed therapies. This page is educational information, not medical advice. Always consult a qualified healthcare professional about your own situation.
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