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Retatrutide
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Retatrutide
Fat loss
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Triple-receptor GLP-1 agonist (it switches on three fat-loss receptors at once), studied for significant fat loss.
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Class
GLP-1, fat loss
Forms
Injectable
Typical dose
4 to 8 mg/week
Cycle
Ongoing, titrated
Onset
Appetite drop in week 1
Tolerance
Nausea early, then eases
Educational summary. See Sources & research below for the underlying studies.
What it is
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Retatrutide is an investigational triple agonist (GLP-1, GIP, and glucagon) studied for some of the largest fat loss in its class.
• Best for: significant weight loss, especially if other GLP-1s stalled
• Status: investigational, not yet approved, sold for research
• Why it is hyped: trials showed very large average weight loss
How it works
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It hits three metabolic receptors at once.
• GLP-1 and GIP: curb appetite and slow stomach emptying
• Glucagon: nudges up calorie burn (energy expenditure)
• Net effect: you eat less and burn a little more
Dosing and mixing
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Reference tiers only. Track the dose you are already taking.
Low
1 to 2 mg, once weekly
FOR Easing in, sensitive users, the first few weeks
BENEFIT Often picked as a gentler starting tier while users assess GI tolerance
Standard
4 to 8 mg, once weekly
FOR Steady, sustainable fat loss for most people
BENEFIT Commonly picked as the middle tier in weight-loss discussions
High
Up to 12 mg, once weekly
FOR Experienced users chasing maximal loss
BENEFIT People report the strongest appetite effect here, with the highest nausea risk
Schedule: One injection per week, same day. Rotate sites.
Beginner ramp: Increase about 2 mg every 4 weeks, only once side effects settle.
Mixing (reconstitution)
BAC water is bacteriostatic water, the sterile water you mix in.
A 10 mg vial with 2 mL BAC water is a common, easy-to-draw mix.
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Ranges are reference only, not a recommendation. See Sources & research below.
How to take it
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Inject under the skin once a week (abdomen, thigh, or upper arm).
• Pick one day a week and keep it consistent
• Rotate the spot each week to avoid irritation
• Refrigerate the mixed vial between doses
What to expect
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Week 1
Appetite drops noticeably. Mild nausea is common as you adjust.
Weeks 2 to 4
Food noise quiets and portions shrink. Some early water weight drops.
Weeks 4 to 8
Steady fat loss settles in as you titrate up.
Months 2 to 6
The main loss window. Most progress happens here with consistent dosing.
Plateaus
Normal, and usually handled by a careful dose increase, not panic.
Keep in mind
Protein and resistance training protect muscle while you lose fat.
Side effects
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Commonly reported
• Nausea, especially early on or after a change
• Reduced appetite
• Constipation or mild fatigue
• Burping or reflux
See a clinician if
• Severe or non-stop vomiting
• Severe abdominal pain (possible pancreatitis)
• Right-side pain (possible gallbladder)
Storage
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Keep it cold, before and after mixing.
• Powder: refrigerate, it tolerates short room-temp and shipping
• After mixing: fridge, use within about 4 weeks
• Do not freeze, keep out of light, swirl gently
Common stacks
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• Retatrutide + BPC-157: people pair these when GI comfort is a concern during GLP-1 use
• Retatrutide + Glutathione: people pair these when antioxidant use is part of their routine
• Retatrutide + CJC-1295/Ipamorelin: an advanced pairing people choose when muscle retention is a concern
Sources & research
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Phase 2 trial reported very large mean weight loss over 48 weeks.
Jastreboff et al., 2023 · Jastreboff et al., NEJM 2023 ↗
Triple-agonist design
Adding glucagon appears to raise calorie burn, not just cut appetite.
Status
Still in trials, not approved, long-term safety data is not yet complete.
Sources are provided for education and are not exhaustive. Where a source names a specific trial or journal it is shown above; always confirm with a licensed clinician.
Educational and research information only. Not medical advice. Always confirm dosing and safety with a licensed clinician.
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