The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Perimenopause Supplements for Weight Loss — What Works
Weight gain during perimenopause is common due to declining oestrogen levels, slower metabolism, and changes in appetite regulation. While supplements are heavily marketed for perimenopause weight loss, evidence for most is limited. This guide explores what research actually supports, when supplements may help, and how prescription weight management options fit into a broader approach to health during this transitional phase.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Why Weight Changes Happen During Perimenopause
Perimenopause—the transition to menopause lasting 4-10 years—brings significant hormonal shifts. Declining oestrogen affects how your body stores fat, particularly around the abdomen. Your metabolic rate can drop by 2-8% during this phase, meaning you need fewer calories to maintain the same weight. Additionally, hormonal changes affect hunger hormones like ghrelin and leptin, often increasing appetite and cravings. Sleep disruption from hot flushes and night sweats further impacts metabolism and makes weight management harder. These are biological changes, not personal failings—your body is genuinely working against you during perimenopause.
- Oestrogen decline slows metabolic rate
- Fat distribution shifts towards the abdomen
- Appetite regulation hormones become less sensitive
- Sleep disruption worsens metabolic control
- Stress hormones (cortisol) rise, promoting fat storage
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Supplements for Perimenopause Weight Loss — Evidence Review
Many supplements are marketed specifically for perimenopause weight loss, including black cohosh, sage leaf extract, red clover isoflavones, and various herbal blends. However, evidence is mixed. Some studies show modest benefits for hot flushes and mood (particularly sage and black cohosh), but weight loss benefits are not well established. Supplements like conjugated linoleic acid (CLA), green tea extract, and glucomannan have general weight loss evidence but are not specific to perimenopause. Always discuss supplements with your GP before starting—some interact with medications, and quality varies significantly between brands. Your GP can advise whether a supplement is appropriate for your individual health profile.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Do perimenopause supplements actually help with weight loss?
Evidence is limited. While some supplements (black cohosh, sage) help with hot flushes and mood, direct weight loss evidence is weak. Weight loss during perimenopause typically requires calorie deficit, physical activity, and sometimes prescription medication—supplements alone are unlikely to produce significant results.
What's the best approach to weight management during perimenopause?
Combine lifestyle changes (strength training, adequate protein, regular activity), NHS weight management programmes, and consider prescription options if you meet eligibility criteria. Use our free BMI calculator to track where you fall on health ranges, and discuss personalised options with your GP.
Can prescription weight loss medication help during perimenopause?
Yes. GLP-1 medications like Wegovy may help with appetite regulation, which is particularly valuable during perimenopause when hormonal changes increase hunger. Eligibility depends on BMI and health conditions. Your GP can assess whether you qualify for NHS treatment or discuss private options.
Should I use a weight loss supplement instead of seeing my GP?
No. Supplements should complement, not replace, professional support. If you're struggling with weight during perimenopause, speak to your GP—they can assess underlying causes, rule out thyroid problems, and recommend evidence-based options including prescription weight management if appropriate.
How can I track my progress during perimenopause weight management?
Use our free progress tracker to log weight changes alongside lifestyle modifications. Track not just weight but energy, sleep quality, and how clothes fit—hormonal fluctuations mean the scale doesn't always tell the full story during perimenopause.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.