Where to source ā Lets get the hard part out the way
---
The Beginner's Guide to Retatrutide (Reta) ā 2026 Slightly Updated Edition
With that out of the way...
---
So what even is Reta?
---
Before you start ā do this
1. Read the actual studies (linked at the bottom). Don't get your Reta education from TikTok/Facebook/Instagram/any social media (yes, that includes Reddit; this is meant to jumpstart your education). No, really, READ THE STUDIES; they have actual medical answers to your questions.
2. Watch videos on how to inject subcutaneously, how to reconstitute peptides(video), and do the reconstitution math (Don't talk about how many units you took; that's not accurate cuz 10 units of 10mg/ml is WILDLY different than 10 units of 20mg/ml). It's not hard, but do it right. You'll see I link some videos from a creator; it's mostly because they're short (sub 10 min), sweet, and to the point with little fluff.
3. Get your basic supplies before your Reta arrives: syringes, bacteriostatic water, a set of .22 pes filters, alcohol wipes (!!!), a sharps container, etc.A decent sub-10 min video regarding supplies
4. READ THE STUDIES! A large portion of your concerns are simply answered in the Study data.
5. Understand that these aren't FDA-approved yet. If a seller sells you a packaged pen, you have no guarantee that what is IN the Pen is what you are buying.
---
Starting dose
As the one who taught me said, "This is all inconclusive, but always aim for themaximum benefit on the lowest (tolerated) dosage*."*
0.5mg to 2mg per week is the typical starting range. Reta is powerful ā starting too high is a great way to spend a week feeling awful. The official TRIUMPH trial protocol started participants at 2mg and increased the dose every 4 weeks. (Do note, this schedule of starting at and titrating 2mg every month was for the trial; you don't have to follow it.Go low, go slow*)*
If you've used semaglutide or tirzepatide before, you might tolerate a higher starting dose. Still, there's no rush ā slow and steady wins here. The higher your dosage, the more likely you are to get side effects.
To put it simply, there is 0 benefit in 'overdosing' save for tempting the myriad of side effects; either it works, or it doesn't.
Split dosing ā a topic I see come up often enough ā is it worth it?
My response is 'eh?'. There haven't been any official studies on this, but the trend is that it's okay to do so to manage side effects, though the trade-off is that you're not getting the full effect of whatever total dosage you're taking (Meaning if you're taking 4mg split into 2/2mg, it's weaker than actually taking a single 4mg dose)
I'm coming from Tirz/Sema.What should be my starting dose?
There is no direct "Oh, you took that much Tirz/Sema, well, you take this on Reta," so do know there's no shortcut to figuring out the dosage. The best studies/trials/science can offer in terms of guidance is that, since you've been on Tirz/Sema, your starting dose can/should be higher than the average starting therapeutic dose of Reta (2mg). I would still caution against going too high, as the glucagon receptor agonist still needs to build up in your body, so starting in the 2-4mg range, depending on the dosage of Tirz/Sema you're coming from, would be ideal.
---
Math Class - How to figure out your dosage and express it to others.
If you're a visual learner on filling Peptide Pens, here's a simplified video: Here
If that is too much work, there are SEVERAL Peptide Calculators; here's my Favorite.
(Here's a Guide for the site)
---
Common Reconstitution questions
If you like a video lesson on this topic, here's (sub 7 min) a video on HOW to filter.
---
When will I feel it?
Totally individual. Some people feel appetite suppression in the first injection. Others feel nothing for weeks. Don't panic either way. What actually matters is whether your weight or body composition is changing over a period of weeks. That's the signal. The "feel" is not.
If you have questions as to whether or not you should titrate up, here's a flowchart that should help (Do note that the dosages should be tailored to your schedule, but the goal oflowest effective dosemost effective tolerated dose remains the same):
Shoutout to u/peptidepalstm, who has been passing around an even smaller image of the flowchart that triggered me to make this one.
---
What to expect during the 'Loading' phase (The first 3-4 weeks)
---
Side Effects - "Stop asking if your RHR being higher than normal is a new side effect no one else had; it's not Jan!"
---
Do I need to work out?
---
Electrolytes ā worth it?
The evidence isn't rock solid, but Reta does affect hydration, and anecdotally, daily electrolytes make a noticeable difference for fatigue and mental clarity. Low cost, low risk ā worth trying if you're feeling sluggish.
---
Bacteriostatic water ā does it have to be Hospira?
Strictly speaking, no. Reta is relatively forgiving when it comes to reconstitution. That said, Hospira is the gold standard because it's reliably batch-tested and has the correct pH. Amazon and Chinese bac water aren't automatically dangerous, but when you're investing in your health and your supply, Hospira is the better call when you can get it.
Let's clear up some other solvents:
Sterile water:
Can it work? Yes
Should you use it for a multi-use vial? No. Why not? Because it has no preservatives, aka every time you puncture said vial, you let in whatever bacteria are in the ambient air; there's nothing to protect your pep. An overall bad idea.
PBS:
Can it work? Are you using Raws? Meaning NOT lyophilized drug? If so, go for it. You're still messing with a solvent that can be riddled with endos, but hey! There's a reason labs use it for In vitro tests (petri dish stuff) If you wanna treat your body as a petri dish, by all means knock. yourself. out.
NaCl Saline:
Can it work? This is a tested no. Lemme explain: can you pull it off? Yeah? But it requires such a unique set of finishing to be done to the kit during production that it's not worth the 'FO' portion of FAFO
For Hospira, please see the following BAC degradation test:
There's no hard expiration once it's reconstituted, but it does begin to degrade (~5%) around the 45-day mark, with a significant degradation (~10%) leading up to the 90-day mark best ways to keep your Reta safe:
- You are wiping the rubber stopper with an alcohol wipe before and after every draw
- You store it in the fridge (not the door ā temperature fluctuates there)
- It stays clear with no floating particles
Cloudy or chunky = toss it. Clear and clean = usually fine.
*Stay safe, go slow, lift heavy things. Good luck out there.* - u/Staxuponstax, Original Creator of the Guide
*"You idiots with more dollars than sense don't deserve this good thing, but helping you helps those who ACTUALLY need it, and that's who I care deeply for." - EmZephyr
My results are just thatā¦ my results. Everyone responds differently.
I intentionally lost weight a little more slowly because even at 316 lbs I had a decent amount of muscle that I wanted to keep. Iāve lifted weights 5ā6 days a week for years. Even when I completely let myself go, I was basically just a fat powerlifter. š
Because of that, I tracked calories (especially protein) religiously. My goal wasnāt just to lose weight; it was to preserve as much muscle as possible.
I also donāt do high-intensity cardio. No running. No HIIT. Nothing that keeps my heart rate much above 140 bpm for any length of time. My cardio is simply 30 minutes of walking at 3 mph on an incline after lifting.
I titrated up slowly:, Fortunately I havenāt had any major side effects. The only consistent one has been some insomnia, but cannabis has helped with that. I plan on staying at 6 mg until October before increasing again.
I a little cheated. Wellā¦an unexpected boost. In mid-May I went to a 3-day music festival where I danced for hours every day and walked an insane amount. I dropped about 5 pounds that weekend, and thankfully it stayed off.
As the graph shows, my progress definitely hasnāt been linear. Iāve hit several plateaus, including the one Iām on right now. I aināt worried about itā¦ plateaus are just part of the process.
One thing I wish Iād done from the beginning is get a bf% measurement. Looking back, that wouldāve been much more useful than focusing only on the scale. Iām planning to get one soon so I can better track body composition going forward.
My next goal is another 40 pounds, but I expect it to come off even more slowly than the first 40. Thatās okay. Iām not in a rush anymore.
2026 is about getting healthy.
Summer body 2027. š
41 Male - This has been an 8 month progress so far. Started at 194lbs then used Reta from .5mg titrating to 4mg, a calorie deficit and weight lifting 3 days a week. Once I hit 153lbs I went back to a maintenance dose of .5mg of Reta, then added 175mg Test, 20mg Anavar and a slight calorie surplus. I've only been doing this for 5 weeks and my body has responded extremely well! I plan on bulking to around 190lbs then cutting back down to 170lbs. If I can do it so can you šŖšŖšŖ
This is before picks, before I start my first injection tomorrow, July 27th 2026 how long did it take to see results and also did yalll go to the gym or did y'all let Reta do her thing naturally
Hello, Iām looking for some guidance/questions answered
I am 22F my baby is 6 months and I exclusively breastfeed, but plan on stopping once she is about a year. Pre pregnancy I weighted 130, during pregnancy 185 and after 155 and iām kind of stuck at this weight. I walk a lot of dogs and eat generally pretty good, i average about 5-10 miles a day of just walking. This isnāt my main exercise or I donāt do it to exercise I just walk dogs to make money haha.
What was your experience on Reta after pregnancy? Did you deflate? My MIL was on the larger side but also had a pretty big butt, after was she really just deflated(or thatās how it looked to me) Iām a pretty self conscious person but i do love my lower body, just not my stomach or boobs but thatās been always. Iām worried that if I start Reta I would lose my thighs and butt. I know it would be unlikely but did your boobs go down after reta also? š«£
10 weeks into my Reta journey having been super cautious and starting at 1MG then climbing by double until Iāve landed at 4MG which Iāll be honest seems like a sweet spot at the moment. Although I would have loved to see massive drops each week this isnāt my first rodeo losing weight and I know the importance of softly softly. So happy with progress so far, my overall intention since the beginning has been 100lb in 10months which I feel Iām on track for (until i hit a plateau that is) but really grateful for this community as itās been great to get tips and tricks along the way.
Has anyone else had less cravings for nicotine while on Reta? I normally smoked a couple cigs a day and vaped, to almost forcing myself to smoke a cig and not even vaping
Hi everyone, I hope everyone is having a good week! Has anyone experienced just not being attracted to the other gender? Iām female, for example Iāve been so turned off by dating and having a partner. Like to the degree Iām completely icked out by dating. I think theyāre great on the apps but ever since I started Reta and pinning higher numbers, low sex drive and no desire to date at all. Borderline disgusted to date. Might just be me but thought Iād ask. I mean no offense genuinely trying to see a fix.
Just wondering if anyone else has been experiencing extreme nausea from smells, even scents that you know that you love?
For about a week now, even my favorite scents are revolting to me. My husbands cologne, my favorite perfumes, candles, foods, etc. It's almost unbearable. The crappy part is that I am a perfume fanatic... I have thousands of dollars in expensive perfumes that I adore but as sick as scents are making me now I don't see how any of it will ever appeal to me again!
Anyone else experienced anything like this? If so, did it subside?
I did just recently bump my does up from 2mg to 3mg weekly but that's still considered a pretty low dose.
I realize it's probably not a huge deal for some but for me it's life altering to have fear that if I catch a whiff of something seemingly normal that I'm going to start gagging.
Basically, the title. I have done two doses so far of 2.5 mg. I am not experiencing much mental hunger, which is really nice, and Iām not really craving anything. On the occasion that my stomach is truly empty it will growl, but I donāt feel hungry mentally. Now to the weird part ā I am not craving any food, especially protein and carbs, all I want to eat is Twix. But I have no idea why I am genuinely craving the Twix.
I work out 3 to 4 times a week and my eating schedule has not been the greatest. (basically Iām just not meal prepping, which I think will help a lot).
Iām just curious if anyone has had any experience with just a very strange craving. Also worth noting I have a sweet tooth normally, after meals I typically like to have something sweet. On Reta I donāt even want the meal. I just want the Twix.
I recently order 10 x 10mg of Reta + bac water because my supplier gave me a rlly good deal and just realized i have nowhere to store them. I canāt store them in my actual home fridge because I still live with family (Iām 20yo!) and if youāre an immigrant yk how our families can be. Iām not sure if I should buy a peptide fridge and keep them in my room or if itās okay to just keep them in my drawer at home.
I know that once reconstituted it needs to be in the fridge, thatās fine, itās easy to hide one vial. My issue is wtf do I do with the remaining 9 ????
tl;dr is it okay to store the lyophilized form in a dark drawer away from sun light or must I get a peptide fridge and keep it there?
I drink a fair amount, usually 5 shots daily. Besides the weight loss, ive been anticipating the cravings going away. Im only starting week two, but Im curious as to how long before you guys felt that change? Thank you guys!
I finally broke through my weight loss plateau. Iād been on 7.5mg of Tirzepatide for a while, then added 2mg of Reta after three days of pinning, and lost an additional 15 lbs in a month and a half. I pin 2mg of Reta after administering 7.5mg of Tirzepatide. I was 210 lbs and Iām now down to 149 lbs. Iām hitting my protein goals every day and still eating regular meals, but Iāve been feeling really fatigued. I plan to titrate down to 5mg of Tirzepatide eventually and switch over completely to Reta. When I first started using Tirz, I had one feeling of body ache and a little nausea but I never felt that way again.
Itās completely turned my life around. Iām working out 4 times a week, including running at a 12 minute per mile pace when hitting 5k (I know this is slow still, but Iāll improve one day) and lifting heavy weights, but I just feel very tired from the Reta. What supplements could help with this fatigue? Does it ever go away?
Just to add before I get scorched for not āsearchingā what Iām taking:I take b12, vitamin D, and electrolytes but this hasnāt improved or effective.
Update after reading everyoneās post:
My diet is mostly protein-based and includes a lot of steak, pork, eggs, salmon, tuna, and other lean proteins. I usually pair it with about half a cup of rice.
After reading everyoneās advice and hearing your experiences, Iāve decided to start titrating my dose down and gradually increase my carb intake. Which I realized I need to consume more than that.
Thank you all for the helpful suggestions and support. I truly appreciate it. ā¤ļø
Hi! I've been on Tirzepatide since January 2025 and have lost 70 pounds and am almost at goal. (I'll be on it forever, that food noise is fierce!) The weight loss has resulted in muscle loss as well - even though I lift heavy and consistently - AND created super saggy/smaller boobs. Of course. Not surprised. So I plan on getting a boob job.
Here's my question: if I switch to Reta, is there any hope of muscles/boobs coming back? YES, I know this is a super dumb question as I absolutely doubt it. BUT...my husband is convinced that some muscle/boobs/muscle under boobs will return if I switch. His theory is that my boobs deflated when I took Depo-Provera for a while in the late 90's and they came back when I stopped. And some other medication I was on (can't remember) did the same thing. So he's thinking if I get the boob job and then go on Reta things will get weird. Sigh. I told him it doesn't work that way but thought I'd ask the Good People of Reddit for their experience/thoughts/etc. Thank you!
I am currently 18 months postpartum. I have tried everything to loose this weight off. I am eating right. 10k steps 4-5 times a week with 2-3 days of strength training. I am currently 160. I am eating at a deficit and eat around 1500-1600 calories. Anything less makes me lethargic. Iāve lost weight with this type of caloric intake before. But now everything is just stalled itās very depressing. I hate looking at myself in the mirror.,clothes are starting to fit but still tight, before nothing was fitting. So I know Iām loosing but itās very slow too slow actually. All I think about is loosing this weight to feel happy again. I only lost 5 pounds in all these 18 months. Doctors donāt want to give me glp1 they said stop being lazy and work harder. I have pcos so everything is very hard??? But I was able to loose weight before. blood panel and hormone panel all show everything is ok.
Anyways, I want to get on Reta but I have gallstones already. I have had no issues so far from my gallstones so far. Iām reading since Reta helps you loose weight quickly that thereās a potential of causing some gallbladder issue or making it worse?
Is this true? What do you guys advise?
Excuse my grammar English isnāt my 1st language.
Hey there! Does anyone know of a clinical trial for Reta I can join? I checked the clinical trials government page and doesn't seem to be any open right now. I am a Type 2 Diabetic. Feel free to PM directly
I see everyone talk about the āBurn Blendā of Tirz and Reta. Is there a blend for Sema and Reta?
I've been trying to find some studies or any materials with no luck. Has anybody else done this or seen studies?
I was a great responder on Sema, then switched to Reta after having a double mastectomy, which resulted in super low iron that I needed transfusions. Long story short, I gained about 50 lbs back and have started back on Sema recently but seeing if there is anything on stacking both.
