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| Retatrutide Progression |
Testosterone, or any other drugs besides basic stuff like Vitamin D, Creatine, and Collagen.
That said, I have been following this space for years, and Retatrutide has emerged as the Holy Grail of peptides and weight loss. Amazing results are emerging from the official Eli Lilly Retatrutide study, and it isn't just about weight loss.
Retatrutide is the successor to Novo Nordisk's GLP-1 drugs Ozempic/Wegovy (Semaglutide) and Eli Lilly's Mounjaro/Zepbound (Tirzepatide). Sometimes it is referred to as GLP-3 because it is a 3rd-generation triple agonist targeting 3 receptors, unlike Ozempic, which targets a single receptor.
Retatrutide is NOT approved by the FDA and is currently undergoing research in a Phase III clinical trial called Triumph. It is NOT expected to be approved by the FDA until 2027 or 2028.
Participants in the Retatrutide Triumph trial are losing close to 30% of their weight, among many other health benefits
While Retatrutide is NOT approved by the FDA, it is available under a "research only" provision from many companies. It is a grey area that is intended for medical research. That said, if you walk into any weight-loss or wellness clinic, you will find that many are selling Retatrutide and at quite a premium. They may even label it as a "designer weight loss peptide."
You may also have seen Hims and Hers and other telemedicine firms selling "compounded" Semaglutide and Tirzepatide in the past year. Compounding is another grey area distribution method. Recently, the FDA has been cracking down on compounded GLP-1 drugs. Hims and Hers and other telemedicine firms have stopped selling compounded Semaglutide and Tirzepatide in favor of the real versions from Novo Nordisk and Eli Lilly.
There have been some fears that the "research only" loophole would be cracked down on as well, and some are stockpiling Semaglutide, Tirzepatide, and Retatrutide, which can be safely stored for up to 2 years.
Most of the Retatrutide is coming from China. That isn't necessarily bad. The Chinese even have key patents and processes in play to manufacture Reta. But legitimacy is always a concern. There are real risks with things like endotoxins and the product's legitimacy.
Most sellers or resellers of Retatrutide, including Evolve Peptides, will provide a Certificate of Authenticity to verify the product's authenticity and purity. Some won't even use the word Retatrutide on their website, but will mark the product with something like "GLP-R" where the R stands for Reta. The word "Ratatouille" is TikTok slang for Retatrutide. Either way, the product is sent to labs for purity and quantity testing, as well as for testing for contaminants such as endotoxins. Be aware: you can always fake a certificate of authenticity!
Personally, I ordered a 15mg of Retatrutide vial from Evolve Peptides based on a recommendation from a very well-known biohacker and triathlete, and took the plunge. NONE of this is medical advice. This is just my experience!
In 28 days (Mar 15-Apr11) I lost 22lbs. Yes, I'm sure a ton is water weight, but there was plenty of weight loss as well. The results are simply undeniable. In addition, as a former pro triathlete, I pretty much stopped exercising and instead focused on landscaping. Now, landscaping can be a lot of work, but I had been told you have to be careful how much cardio you do on reta because weight just melts off. I guess it did anyway.
Protocol
For reference, the official Eli Lilly Triumph study starts participants on a single 2mg dose as a once-weekly injection, gradually titrating them up to 12mg.
I decided to go with a 1mg injection on Saturday night, and 1mg injection Tuesday or Wednesday for a total of 2mg weekly.
Keep in mind that vials are ONLY sterile for 28 days. I did end up going past that date, but keep this in mind. You don't want a vial that is too big to get through. Vials also must be kept refrigerated. They risk both bacterial contamination and the peptides themselves breaking down and becoming ineffective. While retatrutide will last longer than 28 days in the vial, standard medical guidelines for sterility still limit it to 28 days.
Given my 2mg a week injection, I really should have bought a 10mg bottle.
If I had planned to take 1mg per week, a 5mg bottle would have been sufficient.
Vials are usually overfilled, so if you get a 10mg vial, it might contain 10.13mg, but you are also never going to get every last drop out of the vial.
GLP-1 Peptides from Evolve
Evolve doesn't just sell Retatrutide. They sell all the GLP-1 peptides along with various other peptides. Here are some common items:
- Retatrutide 15mg Vial
- Retatrutide 10 mg Vial
- Retatrutide 5 mg Vial
- Semaglutide 10mg Vial (Same active ingredient as Ozempic or Wegovy)
- Tirzepatide 15mg Vial (Same active ingredient as Zepbound / Mounjaro)
Supplies I needed other than Retatrutide
It isn't just the Retatrutide that I needed. I also needed...
- Disposable Gloves 100 count - Gloves for sterility.
- Sterile prep pads - Used to wipe the injection site and the tops of both the peptide vial and the reconstitution solution vial before draws.
- Reconstitution Solution (From Evolve) - Sterile Bacteriostatic water vial, which I draw from and inject into the peptide vial to reconstitute the Retatrutide. I ordered extra Bacteriostatic water in case I messed something up. Evolve sells 3ml, 10ml, and 15ml. 3ml is what I used to reconstitute my 15mg Retatrutide vial.
- 1ml Syringes 31g 1/4 6mm 20 Pack - Needles used to inject myself in the left or right abdominal belly fat with peptides drawn from the peptide bottle. A 31-gauge needle is tiny. I don't even feel it. 31-gauge is a happy medium. 32mm is too small and fragile, and 30mm is too thick and can bruise. Also, these are individually wrapped. 6mm in length is the sweet spot for the tip length IMHO.
- 2.5ml Syringes 25ga 25pack - Used to draw the bacteriostatic water and inject it into the peptide vial to reconstitute the peptide. I only do this once per vial at the very beginning. Then you draw from the peptide bottle with smaller needles.
- Collagen (optional) - Given the lower caloric intake on Retatrutide it is important to supplement the building blocks for healthy skin and hair growth. I buy my Collagen from Costco, but this is the brand I use.
- Protein Supplement (optional) - It is super easy to eat too little on Retatrutide, which also includes protein. As a result, I try to drink a protein shake before bed. I go with this Whey protein isolate; it is more expensive, but the protein content is 90% versus 70-80% in concentrate. Also, concentrate has about 10% lactose vs 3% for isolate.Reconstitution of Retatrutide
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| Reta Cheat Sheet |
In my case, because I had 15mg of Retatrutide Peptide, I reconstituted it with 1.5ml of reconstitution solution. In essence, this is .1ml (10 units) per mg, which helps keep the math easy when drawing from the vial. In this case, for my 1mg injection, I would withdraw .1ml (10 units on the syringe) for each shot. This .1ml is my 1mg of Retatrutide
If I wanted a 2mg dose, I would need 20 units (.2ml). The 1ml syringe has a capacity of 100 units.
Ultimately, this is what works for me.
I watched many YouTube videos for best practices in reconstitution. I would recommend watching a few, preferably the longer ones that don't skip minor details and gotchas.
Coupon Codes
I have only ever used Evolve Peptides. If you follow my editorial policy from my pro triathlete days, I only use and recommend products that I actually use.
15% off Evolve Peptides Coupon Code - Use code thomasgerlach
Side Effects
Some people have asked what side effects I have had. Side effects are similar to semaglutide and tirzepatide.
1) Nausea - early on, I did have some low-grade nausea. It wasn't bad, but the food didn't even look appealing. Nothing like you might have with, say, the flu.
2) Diarrhea - early on, I did have some mild diarrhea. That has mostly been corrected. I did have one night where I got up to use the bathroom, which is highly unusual. In general, eating less affects how often and when you have bowel movements.
3) Resting heart rate - my resting heart rate did creep up from roughly 44 to about 50. I was also de-training during this period. Some increase would be expected as a result of that de-training.
4) I did not notice any sleep abnormality, but I have heard this from others. I do pay particular close attention to my sleep and creating a good sleep environment that is dark and cool. I could easily see how Retatrutide makes one run extra hot at night. I also found myself probably waking up less to pee in general than I normally would.
What I noticed
- Food Noise - I would never have understood what food noise was before Retatrutide. The concept makes complete sense now. Basically, you just never think about food. It could actually be dangerous because sometimes you have to remind yourself to eat.
- Eating can be a chore - It brings me back to my athlete days when I was consuming 5000+ calories every day. Sometimes I make a bowl of oatmeal midday, and I struggle to eat it. It might take me an hour, rather than 15 minutes previously.
- Food Bill - Food bill is way down. It is noticeable! Studies have shown that the cost of GLP-1 is completely offset and then some by reduced food costs.
- Snacks - I don't keep a lot of snacks in the house, but 2-3x a week I would go to Publix for some snacks. In the entire first month, I never went to Publix. When I finally did walk into Publix, it felt foreign.
- Energy Levels - Energy levels were normal or even above normal. As a quintessential example, I would go out on a Saturday and landscape all day in 80-degree Florida heat - we're talking like 8-10 hours straight. I would drink a few glasses of water and have a bowl of frozen mango around midday, but I never got hungry and still had energy. I have done this numerous times before without Retatrutide, and I would get famished and really start slowing down towards the end of the day. I never hit a wall with Retatrutride.
I firmly believe my response to Retatrutide was in part due to the glucagon component. Retatrutide is known as GLP-3 as it is a triple agonist molecule, whereas Semaglutide is a single, and Trizepatide is a double. Only Retatrutide targets glucagon, which helps break down fat and mobilize it as fuel.
- Productivity - My general productivity has gone through the roof. This may be a combination of factors, but the lack of food noise may be contributing to this. We take for granted how often food breaks disrupt our workflow. There may also be some placebo effects here, just from trying to be better in general.
- Hair growth - hair growth has declined, most likely due to the lack of nutrients. I need to stay on top of my collagen intake, which I add to my morning coffee. I really noticed the slower growth in facial hair.
Why Retatrutide and Not Semaglutide or Trizepatide?
According to data from Q3 2025, 12.4% of US adults are on a GLP-1. I could have chosen Semaglutide (Ozempic) or Tirzepatide (Wegovy), Evolve sells both as well, but I chose to go with Reta as the 3rd generation, triple-agonist, versus the single agonist (Semaglutide) or double agonist (Tirzepatide).
GLP-1s have been around for decades, but each one keeps getting better. They are working on the 4th and 5th generations as well. Reta is widely available and is all the rage. I took Reta, fully understanding that the FDA may crack down on it, making it unavailable until it officially gets approved.
That said, I would have no problems switching to Tirzepatide. I know many people who are on Tirzepatide and have had great results as well with minimal side effects.-
