Metabolic
Retatrutide
Still in trials, not available to buy or be prescribed anywhere yet. It works on three fronts at once: appetite, blood sugar, and directly burning fat. Early results are some of the strongest seen in this drug class — but 'not approved anywhere' is still the honest current status.
Triple // — the strongest weight-loss data of any drug in development, not yet approved anywhere.
How well studied
Tier Guide: A = Well studied, B = Some good studies, C = Early evidence & D = Barely studied
Backed by large human trials — we have solid data on how it works and what it does.
Heightened caution: this compound carries unresolved regulatory, safety or supply-chain concerns in the UK. Nothing here is a recommendation to use it.
How it works
Three separate hunger-and-metabolism switches get hit at once, more than any other weight-loss drug — which is why the results are so strong.
Hits three metabolic switches at once — reduces appetite, increases fullness signalling, and directly increases fat-cell energy burning via the pathway.
Reported benefits
- Largest weight loss of any drug in this class — ~28.7% at 68 weeks in trials
- 82% average liver fat reduction in MASLD substudy
- Improves blood pressure, triglycerides, glucose and insulin markers
Who it's typically used for
Timeline to results
Dosage
Trial ladder: 1mg → 12mg over 12 weeks, titrated against bloodwork under clinical supervision. Not a self-administration schedule.
Side effects
- Nausea~43%
- Diarrhoea~33%
- Constipation~25%
- Vomiting~21-25%, main dropout driver
- Dysesthesia (skin tingling)~21%, unique to this drug
- Heart rate increase+5-10bpm, peaks week 24
Getting it in the UK
No UK doctor can prescribe this at all. It's sold online labelled 'not for human use' — nobody is checking what's actually in it, or whether it's safe.
MHRA: the UK government body that checks a medicine is safe and actually works before doctors are allowed to prescribe it.
Content freshness
- Last reviewed
- 11 Aug 2026
- Regulatory status last checked
- 11 Aug 2026