What is proven, what is marketing, what is risky? An honest look at weight-loss injections, "healing peptides" and the like – and a community where we share experiences.
Peptides are short chains of amino acids – "mini proteins", so to speak. Many of them are messengers that the body produces itself. Medications specifically mimic or amplify these signals.
2 to about 50 amino acids. Longer chains are called proteins. Insulin (51 amino acids) sits right on the boundary.
Peptides bind to receptors and trigger signals – e.g. satiety (GLP-1), insulin release or growth hormone release.
Peptides are largely digested in the stomach. That is why most are given subcutaneously – but there are exceptions (e.g. oral semaglutide).
Large clinical trials with thousands of participants, controlled manufacturing, package leaflet, doctor's prescription. Side effects are known and documented.
Mostly only animal or cell studies. Sold as "not for human use" – without quality control for purity, dose or sterility. You bear the risk alone.
For each peptide: status, evidence and the most important risks. Deliberately without dosing information – that belongs with your doctor or in the package leaflet.
e.g. Mounjaro · GIP/GLP-1 dual agonist
e.g. Ozempic, Wegovy, Rybelsus · GLP-1 agonist
GIP/GLP-1/glucagon triple agonist
"Body Protection Compound" · synthetic gastric peptide
Fragment of thymosin β4
Growth hormone secretagogues
Copper peptide · not an approved medication
All 21 peptides in the peptide index →
As of September 2026. Regulatory situations change – we update the overview regularly.
Most problems are not caused by the peptide itself, but by poor quality, false expectations or a lack of medical supervision.
Legal framework (in short): In Germany, tirzepatide and semaglutide are prescription-only. Unapproved peptides may not be sold as medicines. For competitive athletes, many of them count as doping. This is not legal advice.
Honest answers to the questions that actually come up in everyday life.
−6 kg in 11 days, no food noise, no side effects – with all measurements and honest words about the costs.
Experience report · Alexandra, 43Stubborn fat pockets and water retention in menopause – why she started and what women should keep in mind.
Why GLP-1 medications such as tirzepatide and semaglutide cause constipation, what helps day to day and when you should see a doctor – clearly explained.
Nausea is the most common side effect of GLP-1 medications. Why it happens, what helps day to day and when it is a warning sign.
If you lose weight quickly with GLP-1 medications, you also lose muscle mass. How much, why it matters and how protein and strength training counteract it.
How many mL are 10 units? U-100 syringes simply explained, with a conversion table, common mistakes and a free calculator.
What studies on stopping tirzepatide and semaglutide show, why many people regain weight and how you can prepare.
Why some people lose hair on GLP-1 medications, whether it is permanent and which blood values and nutrients you should have checked.
Save mixing recipes, keep track of vials with shelf life and remaining amount, log doses and injection sites. The tracker suggests the site that has gone unused the longest.
Example view
The most common source of error is converting: mg, mL, units, clicks. The calculator shows you where on the U-100 syringe, the pen or the nasal spray the amount you were prescribed lies. With warnings if something doesn't add up.
Go to calculatorHonest exchange among people who deal with peptides: everyday tips against side effects, nutrition & protein, tracking, experiences – and questions you don't dare ask your doctor. (The community is German-speaking.)
Anyone who breaks the rules is removed without discussion. That protects everyone.
The community is open. One click and you're in the Peptid-Klartext WhatsApp community.
Join the WhatsApp communityBy joining, you accept the rules on the left. Free, and you can leave at any time.
No. We don't sell anything, don't link to shops and don't take money from manufacturers. References to sources are deleted in the group too.
For approved medications, your doctor determines the dose. For unapproved peptides there are no established doses – a number on the internet would suggest a certainty that doesn't exist.
We use a WhatsApp community. In the announcement group, other members cannot see your number. In groups where you post, it is visible to the other members. So think about which health information you share.
A private project by people who have their own experience with peptide therapies. We are not doctors – that's why we put studies into context instead of recommending treatments.
The overview is reviewed regularly. The date is shown below the peptide overview. We are happy to receive reports of errors by email.