Peptides are pharmacologically active. They deserve the same clinical screening as any other prescribed therapy.
Peptides have moved into mainstream wellness so quickly that the clinical framework around them has sometimes lagged behind. We see clients who have been started on peptide courses without any blood work, without a medical history review, and without a clear protocol exit point. That is not how we run them.
Why blood work matters. Peptides act on specific receptors and signalling pathways. Growth-hormone-releasing peptides, for example, change IGF-1 levels, which we want to track. Sleep and longevity peptides affect inflammation markers and cortisol, which baseline values help us interpret. Thyroid status, liver and kidney function, fasting glucose and HbA1c, lipids, and a complete blood count form the standard baseline panel for most peptide protocols we run.
What we screen for explicitly. Hormonal imbalances that change which peptide is appropriate. Liver enzyme elevations that change which peptides to avoid. Kidney function that determines dose adjustment. Cardiovascular risk markers when the goal involves growth hormone axis stimulation. Cancer-relevant markers in clients with a personal or family history.
Cost-effective screening. The full baseline panel costs a fraction of a peptide course. Running it adds 7 to 10 days to the start, while we await results, but it makes the protocol meaningfully safer and the results easier to interpret.
We repeat key markers at the midpoint of any sustained protocol, typically at week 12, and again at the end. The comparison is what tells us whether to continue, adjust, or stop.
Who needs to be especially careful. Clients with a personal or family cancer history. Anyone on prescription medications that interact with hormonal axes. Anyone with thyroid disorders. Pregnant or breastfeeding clients. We have specific protocols for each scenario, and sometimes the right answer is to delay or decline peptide therapy entirely.
A clinic that starts you on peptides without blood work or a medical history review is not running a clinical protocol. It is running a sales process.