Forum › Dosing & Titration

Does and don’ts?

55 replies26 peopleAug 2, 2026☆ Follow
Summary

What diet, dosing, and add-on peptides work best when starting retatrutide while avoiding side effects and preserving muscle?

Users share personal experiences starting low and slow on reta after prior tirzepatide issues, with mixed results on keto versus higher-carb approaches. Some add peptides like tesamorelin or CJC/Ipa only after stabilizing on reta, while others report better fat loss and energy once carbs are increased. Weight loss is inconsistent at 1-2 mg and often requires patience or dose increases; sleep disruption and constipation are common early complaints.

What this discussion establishesWhere people disagree

Whether carbohydrates are beneficial or unnecessary on reta, and how aggressively to stack additional peptides early on.

Still open

Why some users see no scale movement for weeks even at accurate calorie deficits, and the ideal long-term carb intake for strength and fat loss.

Nothing here is advice.

55 replies · 26 people · page 1 of 2
RustLedger88archiveopening postAug 2

I began Reta today after using Tirz about a year ago. I ramped doses too fast last time and felt bad enough to stop, so this round I’m trying just 1 mg the first week. I usually rely on keto for maintenance or cuts, but I’ve heard low-carb might not pair well, so I’m wondering what eating style and deficit size to aim for. I plan on lifting three times a week though work may drop it to two. Any supplements people like, side effects worth watching, or other peptides worth adding later? Goal is fat loss plus strength. Also my stomach already feels warmer an hour after injecting and there’s a weird acidic throat sensation.

GreyLedger42archiveAug 2

MacroFactor helps track nutrients and calories while setting a goal weight and timeline so the deficit matches the target date. On tirzepatide myself, I’d suggest adding Tesamorelin or CJC-1295 no dac with Ipamorelin to burn fat while keeping muscle, plus MOTS-c to boost workout effects.

PlainAlder11archiveAug 2

Let the guy settle in before stacking extra compounds; starting Reta alone can already feel overwhelming.

RustSparrow51archiveAug 2

Go low and slow with Reta. At higher doses split into two shots a week if sides hit. My body couldn’t handle 4 mg at once so now I do 2 mg twice weekly with no issues. Since keto is what you know, stick with it but ease off the strict version. I still do keto plus one carb-up day a week, have dropped 20 lb in seven months on Reta with IF, and just listen to how you feel.

SteadySparrow75archiveAug 2
↳ replying to @PlainAlder11

Exactly, he’ll be lost trying to figure out which peptide does what. Still, Reta itself is a good pick.

CopperSignal27archiveAug 2
↳ replying to @GreyLedger42

If you want other peptides that’s your call, but don’t add several at once. Wait until you’ve adjusted to reta, raised the dose, and know how it’s affecting you; otherwise you can’t tell what’s causing what. If messing with growth-hormone pathways, check blood sugar and IGF-1 first.

GreyLedger42archiveAug 2
↳ replying to @CopperSignal27

All solid points. I should have been clearer that the suggestions assume you titrate reta first and add one thing at a time, slowly.

SlowBramble67archiveAug 2
↳ replying to @GreyLedger42

Ipa plus CJC-1295 no dac helps keep muscle and improves how muscles respond to training, but I didn’t see extra fat burning in four months of use. After 31 kg lost my belly fat stayed put until I added eloralintide and tesamorelin, then it softened noticeably.

GreyLedger42archiveAug 2
↳ replying to @SlowBramble67

The ipamorelin part targets visceral fat, just not as strongly as tesamorelin alone.

WryKettle80archiveAug 2

I dose twice a week and took six months to reach 4 mg. Slower progress but zero negative sides, and I’ve dropped 10-12 kg from 100 kg.

BrightSparrow36archiveAug 16

If the scale isn’t moving you’re probably not actually at 1200-1500 calories unless you’re a small older woman.

RustLedger88archiveAug 19
↳ replying to @BrightSparrow36

I am tracking and weighing everything. It feels like an instant plateau, which seems odd. Vivid dreams, worse sleep, and headaches are back, milder than on Tirz though. Electrolytes, daily vitamin, and 128 oz water daily. Pants fit better and bloating is way down even without scale movement.

AmberMeadow80archiveAug 19

The thread title made me think of “Don’t Do What Donny Don’t Does.”

CopperSignal27archiveAug 19

Without age, height, or starting weight it’s hard to say, but if you’re lifting and chasing strength plus fat loss you’re probably not extremely obese. At that calorie level fat loss should be happening even if the scale is stuck, unless there’s a special reason like prior massive loss. Reduced bloating may mean waist is shrinking too. At these low doses many people see little movement; studies showed 1 mg gave 9 % loss over a year, and 2 mg often produces minimal response. Slow titration is wise given your Tirz history.

NorthWillow72archiveAug 19
↳ replying to @CopperSignal27

In the SURMOUNT-1 trial the placebo arm still had a 500-calorie daily deficit target. Losing a pound a week would add up to 52 lb a year, so the placebo result partly reflects that deficit alone.

ClearLantern70archiveAug 19

Lots of useful advice here. Pick a diet and training plan you can stick with long term and titrate only when progress stalls. Re-check food, sleep, and lifting before raising the dose. You may be on this for years, so don’t rush.

CopperSignal27archiveAug 19

Calorie deficits always produce loss, but people are bad at counting and worse at sustaining very low intake without GLP help. Placebo groups usually drop a few percent early then regain most of it; intensive programs can work while support lasts but maintenance afterward is the real challenge. Most GLP trials showed only a few percent loss in placebo arms.

KeenKettle50archiveAug 19

Never count on cardio alone for fat loss. I ate 1600 kcal at 240 lb and did an hour every other day with zero change.

AmberMeadow80archiveAug 19
↳ replying to @KeenKettle50

Training for a marathon made me gain because I got constantly hungry and overate. Now I focus more on intake than output.

RustLedger88archiveAug 22

Week 1 and 2 at 1 mg: nothing. Week 3 at 2 mg: 4 lb down. Probably water retention plus constipation; things moved today. Hunger control is stronger now and I feel more energized instead of fatigued like on Tirz. Belly fat is softening, which feels like progress. Tempted by Klow but waiting. How do people dose it, daily or weekly?

IronFenwick84archiveAug 22
↳ replying to @AmberMeadow80

I pronounce it in my head exactly as spelled: “duz and don’ts.”

PatientHarbour28archiveAug 22
↳ replying to @CopperSignal27

SURMOUNT-1 placebo group lost 3.1 % over 72 weeks while tirzepatide groups lost 20.9–22.5 %.

AmberBeacon57archiveAug 23
↳ replying to @RustLedger88 (opening post)

I do keto plus alternate-day fasting and it works once you’re fully keto-adapted; switching from high-carb will otherwise wipe you out.

PatientHarbour28archiveAug 23

On keto a weekly refeed day using clean carbs works well; swap the usual protein-plus-fat day for protein-plus-carb and keep fat low that day.

BlueSignal49archiveAug 23
↳ replying to @RustLedger88

Hell yeah, keep trusting the process. I haven’t used Klow but tried Wolverine, which shares two components, so dosing should be similar. I injected daily and found pens convenient for that schedule.

AmberBeacon57archiveAug 23
↳ replying to @PlainAlder11

No, you don’t need carbs. The body makes its own glucose; only protein and essential fats are required.

LevelThistle44archiveAug 23
↳ replying to @AmberBeacon57

Physiological necessity isn’t the whole story. Carbs aren’t essential for life but make many things easier and better for most people.

BrightSparrow36archiveAug 23
↳ replying to @AmberBeacon57

Personal results vary, but reta worked better for me once I added carbs back. I had great success on very low carb for years yet still saw further improvement with reta after reintroducing them.

RustLedger88archiveAug 23

Another pound gone. Maybe 1 mg simply wasn’t enough. Can the body plateau that fast? I lost about 5 lb in the month before starting and was holding steady at 5’8 195 lb from 200 lb. Sleep has been worse for everyone else too?

LevelPebble96archiveAug 23
↳ replying to @RustLedger88

Reta is only the tool; diet and enough cardio to create a fuel demand are still required.

BrightCompass57archiveAug 23
↳ replying to @AmberBeacon57

Reta’s metabolic boost seems tied to good carbohydrate intake in my experience.

NorthWillow72archiveAug 23
↳ replying to @RustLedger88

At 1 mg the drug was still accumulating slowly while water was shifting; once the dose rose the scale started moving.

PlainAlder11archiveAug 23
↳ replying to @AmberBeacon57

Hey doc how much time have you actually spent taking that medication? It really seems like you've put together several detailed guides covering the whole topic already. This latest remark will join the rest of your writings.

PatientHarbour28archiveAug 23

Carbs aren’t needed for basic survival but matter for exercise performance, gut health via fiber, and micronutrient variety. Avoiding all carbs makes hitting vitamin and mineral targets much harder and raises other health risks even if gluconeogenesis keeps you alive.

CopperHarbour89archiveAug 23

No trial data require avoiding carbs on retatrutide; the phase-2 study gave standard healthy-diet counseling without mandating any specific deficit or carb restriction.

AmberBeacon57archiveAug 23
↳ replying to @PatientHarbour28

Fat-adapted athletes show no performance drop on very low carb. Carnivore-style eaters maintain comparable microbiomes. Well-planned keto doesn’t produce the deficiencies seen in poorly designed vegan diets. I’m a research biochemist focused on oncology with a strong side interest in nutrition.

PatientHarbour28archiveAug 24
↳ replying to @PlainAlder11

You called dibs on the new book so you get first read, but I’ll buy it from you afterward for a laugh. Have you tried magnesium glycinate? Many people find it helps sleep.

PlainAlder11archiveAug 24
↳ replying to @PatientHarbour28

I’ll just give it to you. Magnesium glycinate did nothing for me, though it helps my wife.

NorthCompass94archiveAug 25
↳ replying to @BrightSparrow36

What does “reta likes carbs” actually mean? I’m on low-carb high-protein and have lost 15 lb in nine weeks. I’m cautious about losing muscle or getting loose skin so slower is fine, but should I add more carbs?

BrightCompass57archiveAug 25
↳ replying to @NorthCompass94

Adding carbs seems to support the metabolism increase; starving yourself doesn’t feel good on reta.

PlainAlder11archiveAug 25
↳ replying to @BrightCompass57

Yup, even at maintenance dose I eat potatoes and pasta, stay the same weight, and have good energy for my age.

PatientHarbour28archiveAug 25

Carbs aren’t the enemy but extremes in either direction cause problems, just like calories. An HPLC approach keeping carbs at 50-100 g supports steady fat loss, blood-sugar control, and metabolic flexibility without deep ketosis downsides. Some do a relaxed keto at 40-50 g or cycle higher on weekends.

WarmFenwick99archiveAug 25
↳ replying to @RustLedger88

Don’t let the internet doctors dismiss it. Reta spiked my cortisol, kept me in fight-or-flight, and I lost nothing for over eight weeks despite perfect tracking at 8 mg from multiple sources. I also had the skin burning and elevated heart rate. Bloodwork is worth doing; this isn’t the most supportive group.

PlainKettle39archiveAug 25
↳ replying to @AmberBeacon57

They don’t seem to know about gluconeogenesis. I ate zero carb for a year and felt the healthiest I’ve ever been; humans have no dietary requirement for carbs.

BrightCompass57archiveAug 25
↳ replying to @PlainKettle39

With reta you do need carbs or you’ll feel terrible all the time.

NorthWillow72archiveAug 25
↳ replying to @PlainKettle39

I get the diet debate, but after hitting goal I refuse to follow any plan so restrictive I can’t enjoy cooking or restaurants. I maintain fine eating a wide variety and don’t want to track food types forever. Had to look up gluconeogenesis.

BrightCompass57archiveAug 25
↳ replying to @WarmFenwick99

I find the group supportive; some people just prefer excuses over accountability. Even with cortisol issues the right calorie intake still produces loss, though it may be slower. Truth isn’t always comfortable but sometimes it’s what you need.

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