Blog
Drug comparisons, country buyer guides, and editorial context that do not fit dosing protocols or the calculator.
For dosing protocols and the reconstitution calculator, see Resources. For the full vendor shortlist behind these country guides, start with our European peptide shop ranking.
Drug comparisons
Head-to-head reads on the GLP-1 and GIP/GLP-1 drugs - what the trials actually measured, what they cost per unit of result, and what switching between them changes.
Comparison·
Semaglutide vs Tirzepatide: What Two Head-to-Head Trials Actually Settled
Tirzepatide won both head-to-head trials - 20.2% against 13.7% body weight, with half the dropouts. Semaglutide holds the only placebo-controlled proof that it prevents heart attacks. Plus what each costs per percentage point of weight lost.
ReadComparison·
Wegovy vs Zepbound: 20.2% Against 13.7%, and Why That Is Not the Whole Answer
The only head-to-head obesity trial favours Zepbound by 6.5 percentage points, with half the gastrointestinal dropouts. But Wegovy holds the heart and liver indications and Zepbound holds sleep apnea - your comorbidity decides this more cleanly than the weight figure does.
ReadComparison·
Ozempic vs Wegovy: Same Molecule, and the Diabetes Label Costs More
Both are semaglutide. The weight-loss gap between them is mostly the trial population, not the extra 0.4 mg. And at maintenance doses Ozempic costs $150 a month more than Wegovy for a smaller dose of the identical drug.
ReadComparison·
Mounjaro vs Ozempic: The Head-to-Head Trial, and What Ozempic Still Wins
SURPASS-2 gave tirzepatide a 60% to 22% margin on the composite diabetes target. Ozempic keeps the kidney indication and the placebo-controlled cardiovascular evidence tirzepatide has never generated - and at maintenance the two cost the same.
ReadComparison·
Foundayo vs Zepbound: What Nine Percentage Points of Body Weight Cost
The first oral GLP-1 pill from Lilly reached 11.2% against 20.2% for Zepbound over the same 72 weeks. It is cheaper per month, 17% more expensive per point of weight lost, and its 17.2 mg tablet is the 36 mg trial dose - not a reduced one.
ReadComparison·
Switching From Semaglutide to Tirzepatide: What Happens in the Four Months
The best-evidenced switch in either direction, and the middle of it feels like failure. Why no conversion chart is trustworthy, what compounded users need to know, how long re-titration really takes, and what switching will not fix.
ReadComparison·
Foundayo vs Tirzepatide: A Small Molecule Against a Peptide
The efficacy gap is the missing GIP receptor, not the tablet - oral semaglutide beats Foundayo too. What the chemistry actually changes: no food or water rules, no cold chain, and a CYP3A4 interaction that halves the ceiling, a problem peptides do not have.
ReadComparison·
Switching From Zepbound to Wegovy: The Question Nobody Tells You to Ask
No official conversion exists, and the charts online are practice patterns rather than evidence. Expect four months of re-titration and a plateau in the middle. Before accepting 2.4 mg, ask about Wegovy HD 7.2 mg, which reached 20.7% in its own trial.
ReadComparison·
Switching From Ozempic to Mounjaro: Restart the Ladder, Fix the Insulin
SURPASS-2 backs the switch on glycaemic control. Two things need handling first: insulin and sulfonylurea doses usually have to come down, and you give up the only chronic kidney disease indication in the pair.
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GLP-1 and women
Where this drug class meets hormones - PCOS, perimenopause, menopause, and the postpartum year. What the evidence supports, what it does not, and the contraception and bone questions that get left out.
Hormones·
GLP-1 for PCOS: The Fertility Benefit Is Also the Warning
GLP-1 drugs outperform metformin on weight in PCOS and restore ovulation in 60-75% of women. Which is exactly the problem: tirzepatide also interferes with the pill for four weeks after every dose increase, and no GLP-1 is safe in pregnancy.
ReadHormones·
GLP-1 for Menopause: The Hormone Therapy Finding Nobody Mentions
These drugs work at least as well after menopause as before - about 23% weight loss in a postmenopausal subgroup. Women on hormone therapy alongside them lost more still. The cost to plan for is not money, it is bone and muscle.
ReadHormones·
GLP-1 in Perimenopause: Telling the Drug Apart From the Transition
Falling oestrogen moves fat to the abdomen, lowers insulin sensitivity, and drops resting expenditure. Two things make this stage distinct: you are still fertile, and perimenopausal symptoms are almost indistinguishable from GLP-1 side effects without dated records.
ReadHormones·
GLP-1 Postpartum: Breastfeeding, Timing, and What Is Actually Known
Every label says not to breastfeed on these drugs, though measured milk transfer is minimal and there is no infant outcome data either way. Nothing before six weeks, often three months. And after gestational diabetes, this is a diabetes prevention decision.
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Essays and country guides
Long-form essays, country buyer guides, literature notes, and editorial context that do not fit dosing protocols or the calculator.
Guide·
The Best GLP-1 Apps in the US: Compounded Doses, Insurance Appeals, and the HIPAA Gap
HIPAA does not cover any app on this list, and a third of US patients are dosing from compounded vials. Ten GLP-1 apps ranked on what those two facts actually change. Zenday App leads at 4.55/5.
ReadGuide·
The Best GLP-1 Apps in Germany: All 10 Ranked, Independently Assessed
Paragraph 34 SGB V classes weight-loss drugs as Lifestyle-Arzneimittel, so the Krankenkasse pays nothing. Ten GLP-1 apps ranked for a market that is private by law - and the five that ship in German. Zenday App leads at 4.55/5.
ReadGuide·
The Best GLP-1 Apps in France: All 10 Ranked, Independently Assessed
France started reimbursing Wegovy and Mounjaro on 15 June 2026 - at 65%, and only above strict BMI thresholds. When treatment is funded and followed, the clinician export changes value. Ten GLP-1 apps ranked, Zenday App first at 4.55/5.
ReadGuide·
The Best GLP-1 Apps in Spain: All 10 Ranked, Independently Assessed
AEMPS has restricted semaglutide prescribing since 2022 and the SNS funds none of it for obesity. Ten GLP-1 apps ranked for that reality, including which five speak Spanish. Zenday App leads at 4.55/5.
ReadGuide·
The Best GLP-1 Apps in the Netherlands: All 10 Ranked, Independently Assessed
Reimbursed Wegovy in the Netherlands requires a documented two-year GLI that did not work - the system asks you to evidence a trajectory, not just try. Ten GLP-1 apps ranked for that, plus the three that speak Dutch. Zenday App leads at 4.55/5.
ReadGuide·
The Best GLP-1 Apps in Sweden: All 10 Ranked, Independently Assessed
TLV refused Wegovy a subsidy in February 2026, so högkostnadsskyddet does not cap what you pay. Ten GLP-1 apps ranked for an uncapped market where only three speak Swedish. Zenday App leads at 4.55/5.
ReadGuide·
The Best GLP-1 Apps in Portugal: All 10 Ranked, Independently Assessed
Wegovy has no SNS comparticipação for weight loss and INFARMED is still evaluating. Ten GLP-1 apps ranked for a market paying 2,200-5,160 € a year privately, plus the five that speak Portuguese. Zenday App leads at 4.55/5.
ReadGuide·
Where to Buy Peptides in Spain: The Most Trusted Shops, Independently Tested
We ordered into Madrid and Barcelona, checked every CoA, and lab-tested the vials. Particle Peptides ranks #1 for Spain (3.9/5): EU-internal shipping and seven-parameter batch testing. No paid placements.
ReadGuide·
Where to Buy Peptides in Portugal: The Most Trusted Shops, Independently Tested
We ordered into Lisbon and Porto, checked every CoA, and lab-tested the vials. Particle Peptides is our #1 pick for Portugal (3.9/5): EU-internal shipping and seven-parameter batch testing. No paid placements.
ReadGuide·
Where to Buy Peptides in Sweden: The Most Trusted Shops, Independently Tested
We ordered into Stockholm and Malmö, checked every CoA, and lab-tested the vials. Particle Peptides ranks #1 for Swedish buyers (3.9/5): EU-internal shipping, seven-parameter batch testing, no paid placements.
ReadGuide·
Where to Buy Peptides in Germany: The Most Trusted Shops, Independently Tested
We ordered into Frankfurt, Hamburg and Berlin, checked every CoA, and lab-tested the vials. Particle Peptides ranks #1 for Germany (3.9/5): EU-internal shipping and seven-parameter batch testing. No paid placements.
ReadGuide·
Where to Buy Peptides in the Netherlands: The Most Trusted Shops, Independently Tested
We ordered into Amsterdam and Rotterdam, checked every CoA, and lab-tested the vials. Primal Peptides ranks #1 for the Netherlands (3.45/5) and is the standout domestic pick. No paid placements.
ReadGuide·
Where to Buy Peptides in France: The Most Trusted Shops, Independently Tested
We ranked peptide shops for French buyers with EU customs in mind. Primal Peptides is #1 (3.45/5) for its reship posture, Particle Peptides second, CertaPeptides third - EU-internal shipping, no paid placements.
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