Short answer: If you are going to try a peptide, change one thing, write down a measurable goal, record a baseline (bloodwork if you can), check that the batch report matches your vial, and know your stop signs before day one. Then log every day for four weeks, change nothing else, and end with one decision: continue, change one thing, or stop.
Education, not medical advice. This is a way to keep a clean record, not a treatment plan. Peptides sold online as research chemicals are not authorised medicines in the EU, and decisions about any compound belong to you and a doctor. This article names no compound on purpose: the rules apply to all of them.
Everyone's on peptides. Almost nobody knows if theirs work. The reason is boring: no baseline, three new things at once, and a memory instead of a record. Fix that and you will know more after four weeks than most people know after a year.
A log turns "I think it helped" into something you can check. It also protects you: if a reaction shows up, you can see when it started and what changed. Four weeks is short enough to stay disciplined and long enough to build a useful record. Start two things at once and you will never know which one helped, or which one caused the rash.
Write it before you order anything, and make it measurable: "less knee pain on stairs, scored 0 to 10" or "fall asleep faster, from my sleep log". That is the measure you check again at week four.
No new supplement, diet or training plan in the same window if you can help it. If life forces a change, such as illness or travel, write it in the notes.
Labels can be wrong. In a 2026 test for KRO-NCRV Pointer, the LUMC in Leiden checked five peptides from five Dutch web shops. All five contained more active substance than the label said, some many times more. Three of five contained substances not on the label, and two jars sold as bacteriostatic water lacked the benzyl alcohol on their label.
If the batch does not match, or you cannot verify the report, do not use the vial. Our 12-point vendor checklist shows how to check a shop.
Write the product, batch code, date opened and the plan you agreed with your doctor at the top of the log. Then write where that plan comes from, from strongest to weakest:
If the only source is anecdote, there is no evidence behind it. Know that before day one. The evidence grade for the compound itself is on our graded peptides hub.
Feeling nothing in week two is not a reason to change the plan. Many goals do not come with a feeling. Check the basics first: your measure, your sleep, food and training. Any change to the plan is a conversation with your doctor, one change at a time.
One row a day, including days you take nothing. Leave a cell empty if you did not measure it; do not write 0 unless you measured 0.
| Date | Time | Taken as planned? (yes / no / missed) | Your measure | Sleep (hours, quality 1 to 5) | Any reaction (what, 0 to 10, how long) | Notes |
|---|---|---|---|---|---|---|
| 12 October 2026 | 08:00 | yes | knee 6/10 on stairs | 7 h, 3 | none | day 1 |
The example row shows the format, not a plan. Once a week, answer five questions:
At week four, make one decision: continue, change one thing, or stop. Patchy records mean "inconclusive", not "keep going".
Research-chemical peptides are not authorised medicines, so your GP may know little about them. Tell them anyway. It changes how they read your symptoms and your bloodwork. Bring the log. If you want this run with you properly, graded, tested and adjusted one change at a time, that is what coaching is for. Not sure where you stand? Take the 2-minute check.
Because you cannot tell which one did what. Start two and get a rash, better sleep or a change in your bloodwork, and you will not know which caused it. One change, everything else steady, four weeks, then decide.
It is not required, but without it you are guessing. A baseline gives you and your doctor something to compare with. A normal result does not prove a compound is safe.
Match the batch code on your vial to the report, verify the report on the lab's own site, and look for identity by mass spectrometry and the measured amount, not only purity. If anything does not match, do not use the vial.
Date, time, whether you stuck to the plan, your measure, sleep, any reaction (what, 0 to 10, how long) and anything else that changed. Fill in a row even on days you take nothing.
Not on your own. A stall is not proof that nothing is happening. Check the basics, keep logging, and discuss any change with your doctor.
Education, not medical advice. If you think you are having a severe allergic reaction, call 112.