The GLP-1 knowledge base
Every GLP-1 question, answered in plain English.
GLP One Hub is an independent reference covering semaglutide, tirzepatide, and every other GLP-1 option — injections, sublingual tablets, compounded formulas, microdosing, side effects, costs, and more. Every answer is sourced from clinical trials, FDA labeling, and peer-reviewed research.
Start anywhere
Browse by topic
- 8 questions
GLP-1 Basics
What GLP-1s are, how they work, and why they cause weight loss.
- 10 questions
Medications & Forms
Semaglutide vs. tirzepatide, brands vs. compounded, injections vs. sublingual and oral forms.
- 8 questions
Weight Loss Results
How much weight people lose, how fast, plateaus, and who qualifies.
- 12 questions
Side Effects & Safety
Nausea, fatigue, hair loss, muscle loss, serious risks, and warning signs.
- 8 questions
Dosing & Administration
Titration schedules, microdosing, injection technique, missed doses, and storage.
- 10 questions
Cost & Access
Prices, insurance, savings programs, telehealth, and how to buy safely.
- 6 questions
Diet & Lifestyle
What to eat, what to avoid, alcohol, protein, and exercise on a GLP-1.
- 4 questions
Stopping & Maintenance
Weight regain, tapering, maintenance dosing, and how long people stay on.
- 6 questions
Special Situations
Pregnancy, PCOS, diabetes, older adults, drug interactions, and surgery.
Quick answers
Most-asked questions
All questions →Are GLP-1s safe to take long-term?
The class has 15+ years of human use (liraglutide since 2010) and large multi-year trials showing sustained safety — including the SELECT trial, where semaglutide reduced heart attacks and strokes by 20% over ~3 years. Known serious risks (pancreatitis, gallbladder disease) are uncommon, and obesity itself carries larger long-term risks for most candidates.
Are telehealth GLP-1 programs legitimate?
The good ones, yes — telehealth prescribing of GLP-1s is legal in all 50 states and is how a large share of patients now access treatment. Legitimacy lives in the details — licensed clinicians who actually screen you, named licensed pharmacies, honest labeling of compounded products, and a human to call afterward. Established programs clear that bar; plenty of websites wearing the costume don't.
How long do GLP-1s take to start working?
Appetite suppression usually starts within the first week — often after the first dose. Visible weight loss typically begins within 2–4 weeks, but the big results take months because doses start low and climb gradually; trial participants were still losing at week 60+.
How much do GLP-1s cost without insurance?
Realistic 2026 cash prices: brand-name via manufacturer direct programs ~$349–$549/month (Wegovy through NovoCare, Zepbound vials through LillyDirect); compounded semaglutide ~$199–$399 and compounded tirzepatide ~$250–$450 through telehealth programs, usually with visits included. Nobody should pay the $1,000+ list prices.
How much weight will I lose on a GLP-1?
Trial averages over roughly a year and a half — semaglutide ~15% of body weight, tirzepatide ~21%, liraglutide ~8%. For a 220 lb person that's roughly 33, 46, or 18 lbs respectively. Individual results spread widely around those averages, and dose, duration, and protein/exercise habits all move the number.
Semaglutide vs. tirzepatide — which is better for weight loss?
For pure weight loss, tirzepatide wins on the data — about 20% average loss vs. 14% for semaglutide in the head-to-head SURMOUNT-5 trial. Semaglutide counters with proven heart-attack and stroke reduction (SELECT), a longer track record, and often better coverage. Both are excellent; tolerability and cost decide many real cases.
What are the most common side effects of GLP-1s?
Gastrointestinal, front-loaded, and mostly manageable — nausea (25–45% at some point), constipation, diarrhea, fatigue, and reflux, clustering around dose increases and fading as the gut adapts. Serious risks are uncommon: pancreatitis, gallbladder disease, and a rodent-based thyroid warning that drives the contraindications.
What is a GLP-1 medication?
GLP-1 medications (like semaglutide and tirzepatide) are synthetic versions of a natural gut hormone that controls appetite and blood sugar. They make you feel full sooner and quiet hunger between meals, producing 8–21% average body-weight loss in clinical trials depending on the drug.
What is compounded semaglutide and is it safe?
Compounded semaglutide is the same active molecule prepared by a licensed pharmacy for an individual prescription rather than sold as the factory brand. From a properly licensed 503A/503B pharmacy it has a reasonable safety record and costs a fraction of brand price — but it's not FDA-approved, quality varies by pharmacy, and it must never be confused with gray-market "research" vials.
What is GLP-1 microdosing and does it work?
Microdosing means deliberately using doses below the standard ladders — for maintenance after goal weight, for very drug-sensitive people, or for documented relapse prevention at lower BMIs. It's biologically plausible (appetite effects appear even at starter doses) and clinically practiced, but no dedicated trials have validated it, so it lives in honest off-label territory with guardrails.
Where can I buy GLP-1 medication online safely?
Three safe online lanes: manufacturer direct pharmacies (NovoCare for Wegovy, LillyDirect for Zepbound) for brand at $349–$549/month; established telehealth programs for compounded therapy at $199–$450; and your own doctor's e-prescription to a verified online pharmacy. Everything without a prescription and a licensed pharmacy is the unsafe lane.
Will I regain weight if I stop my GLP-1?
Most likely, most of it — the extension studies are blunt: about two-thirds of lost weight returned within a year of stopping semaglutide (STEP 1 extension), and tirzepatide withdrawal showed the same shape (SURMOUNT-4). It's hormone biology, not weak character — appetite returns while the metabolic budget stays shrunk. The realistic options: stay on at lower maintenance doses, taper with a habit fortress, or accept partial regain.
Know the molecules
Medications covered
All medications →- GLP-1 receptor agonist
Semaglutide
The most-prescribed GLP-1 for weight management. Produces roughly 15% average body-weight loss in trials and is the reference molecule against which newer options are measured.
- Dual GIP/GLP-1 receptor agonist
Tirzepatide
The most effective GLP-1-class medication currently approved, activating both GIP and GLP-1 receptors. Trial participants lost up to 21% of body weight — the highest of any approved option.
- GLP-1 receptor agonist (compounded form)
Sublingual semaglutide
A needle-free compounded form of semaglutide absorbed under the tongue. Popular with needle-averse patients; absorption differs from injections, so doses are not 1:1 and evidence is far thinner.
- Dual GIP/GLP-1 receptor agonist (compounded form)
Sublingual tirzepatide
A needle-free compounded form of the dual-incretin tirzepatide, absorbed under the tongue. The newest of the alternative forms — appealing for needle-averse patients, with the least published evidence.
- GLP-1 receptor agonist
Oral semaglutide (Rybelsus)
The only FDA-approved GLP-1 in pill form. A swallowed daily tablet approved for type 2 diabetes, with modest weight loss at current doses and a higher-dose obesity version on the way.
- GLP-1 receptor agonist
Liraglutide
The first-generation GLP-1 for weight loss — a daily injection with roughly 8% average weight loss. Now available as a lower-cost generic, it mainly matters today as a budget or adolescent option.
- Triple GIP/GLP-1/glucagon receptor agonist
Retatrutide (investigational)
The most-watched pipeline molecule — a "triple agonist" that produced about 24% average weight loss in phase 2, the largest ever reported for a medication. Not yet available; beware of anyone selling it.
Go deeper
In-depth guides
All guides →- 01
How GLP-1 Medications Actually Work
The mechanism behind semaglutide and tirzepatide, explained step by step — gut hormones, brain signaling, slowed digestion, and why the weight comes off without constant hunger.
- 02
Managing GLP-1 Side Effects — The Complete Playbook
Evidence-based strategies for nausea, constipation, fatigue, reflux, and injection-site reactions — plus the warning signs that mean stop and call a clinician.
- 03
What GLP-1s Really Cost in 2026 — and Every Way to Pay Less
List prices vs. real prices: insurance, manufacturer direct programs, savings cards, compounded options, and the questions to ask before paying anyone.
- 04
Compounded vs. Brand-Name GLP-1s — The Unbiased Breakdown
What compounded semaglutide and tirzepatide actually are, how 503A/503B pharmacies work, what changed after the shortages ended, and how to weigh cost against certainty.
- 05
GLP-1 Dosing & Titration — How the Ladders Work
Why doses start tiny and climb slowly, the official Wegovy and Zepbound schedules, what "stay at the lowest effective dose" means, and how missed doses and switches are handled.
- 06
GLP-1 Microdosing — What It Is, Who It's For, and What We Know
The practice of taking GLP-1s below standard doses for maintenance, sensitivity, or lower-BMI situations — the rationale, the honest evidence gap, and the safety rails any legitimate protocol uses.
- 07
How to Eat on a GLP-1 — Protein, Muscle, and What Actually Fits
The practical nutrition playbook for GLP-1 therapy — protein floors, preventing muscle loss, foods that fight the medication, alcohol, and eating when you're never hungry.
- 08
Beyond the GLP-1: B12, MIC Injections, Lipotropics & Anti-Nausea Support
What the common add-ons in weight-management programs actually are — MIC/B12 lipotropic injections, B12 shots, oral lipotropic tablets, vitamin B6, and ondansetron — and what the evidence supports.