To talk to your doctor about peptides, bring a written list of everything you take or are considering, explain the specific goal you have in mind, and ask directly what human evidence exists for each option. Be honest about any peptides you’ve already used, including ones bought online; a doctor can only check for interactions and side effects with the full picture.[1][2] Expect a frank answer: for many popular peptides, the honest reply is that they haven’t been tested in people, and your doctor may suggest an approved option instead.

This guide covers how to prepare, what to say, which questions to ask and how to read your doctor’s response. For background, see our beginner’s guide to peptides and the peptide basics hub.

Step 1: Prepare before the visit

NIH’s complementary health center gives simple advice that applies well to peptides: list everything on your intake form, update your providers at every visit, ask before starting something new, and raise the topic yourself rather than waiting to be asked.[1]

Write down:

  • Every medicine and supplement, with dose and how often you take it.[2]
  • Any peptide you use or are considering: the exact name, dose, route (injection, nasal spray, cream) and how long you’ve used it.
  • Where it came from: a pharmacy prescription, a clinic, or an online seller.
  • Your goal, in one sentence you can measure.
  • Recent lab results, if you have them.

Bring the actual vials, boxes or bottles if you can. NIH suggests bringing product containers so your provider can check the ingredients.[2]

Step 2: Lead with your goal

Doctors think in terms of problems to solve. “I want to know about BPC-157” invites a short answer. “My shoulder has hurt for six months despite physical therapy, and I’ve read about BPC-157” opens a real conversation about your shoulder, including options with stronger evidence.

A simple script:

“I’ve been reading about peptides for [goal]. I’d like your honest view of the evidence, whether there’s an approved option, and what the risks would be for me.”

Step 3: Be honest about what you’ve already used

If you’ve injected a product bought online, say so. Researchers who bought semaglutide vials from online sellers found purity of only 7.7% to 14.4% and bacterial endotoxin in every sample.[6] As of May 31, 2026, FDA had received more than 990 adverse event reports for compounded semaglutide and more than 730 for compounded tirzepatide, and it warns about products sold “for research purposes.”[7] Your doctor isn’t there to judge; knowing what you took helps them interpret symptoms and decide which tests to order.

Step 4: Ask these questions

  • What human trials support this peptide for my goal? Were they randomized?
  • Is it FDA-approved, compounded or neither?
  • Is there an approved treatment that would be a better first step?
  • How could it interact with my conditions or current medicines?
  • Which side effects should I watch for, and when should I call you?
  • What lab tests would you want before and during treatment?
  • What result would show it’s working, and by when?
  • If it’s compounded, which licensed pharmacy would make it?
  • What does it cost, and is any of it covered?

Our guide to how to choose a peptide grades the evidence for common goals, which can help you prepare.

Step 5: Understand how your doctor may respond

“There’s an approved option.” For goals like weight loss, type 2 diabetes or osteoporosis, approved peptide drugs such as semaglutide, tirzepatide or teriparatide have large trials behind them.

“I could prescribe it off-label.” Doctors may prescribe an approved drug for an unapproved use when they judge it medically appropriate.[3] Insurers often won’t pay for off-label use.

“I can’t prescribe that.” Many popular peptides can’t be lawfully compounded. FDA has placed several in a “significant safety risk” category for compounding.[5] Rules shifted in 2026, but as of October none of the popular wellness peptides had been added to the list pharmacies may routinely use; see the FDA peptide ban in 2026.

“Let me refer you.” An endocrinologist, sports medicine doctor or dermatologist may know the evidence in their area better.

Doctors also answer to their state medical board. The Federation of State Medical Boards’ 2026 guidance expects an individualized evaluation, informed consent, proper records and lawful sourcing for any prescription.[4] A cautious answer may reflect those duties rather than a closed mind.

Step 6: If you disagree

Ask what evidence would change their view, and what they’d recommend for your goal instead. You can request a referral or a second opinion. If you’re weighing a specialty clinic, our peptide clinic vs DIY guide explains what good supervision includes and what it can’t change.

Step 7: Plan the follow-up

Before you leave, agree on:

  • what you’ll try and at what dose (a clinician sets it)
  • which side effects mean you should call
  • which lab tests are needed and when
  • when you’ll meet again to judge whether it’s working

Pre-visit checklist

  • Written list of all medicines, supplements and peptides, with doses.
  • Product packaging or photos of labels.
  • One clear, measurable goal.
  • Recent lab results, if any.
  • My questions, written down in priority order.
  • Honest notes on anything I’ve already used and any symptoms.

The bottom line

A good peptide conversation is specific and honest: one goal, a full list of what you take, and direct questions about human evidence. Your doctor may not say yes to the peptide you came in asking about, but you should leave knowing what’s proven, what isn’t and what to try first. For more on the products themselves, see natural vs synthetic peptides and our peptide profiles.