Weight

GLP-1 (Semaglutide)

5.0(1 review)

$49–$175

Prices checked 1 hour ago

Compare vendor offers for GLP-1 (Semaglutide), including price, dose, and purity.

Dose size

5mgfrom $49 · 3 vendors10mgfrom $84 · 2 vendors15mgfrom $130 · 1 vendor

View all vendors

At a glance · 3 vendors, 6 offers

Avg. vendor rating

4.1

Third-party tested

2/3

COA per batch

2/3

Offers in stock

6 of 6

COA purity range

99–99.791%

Ships from

2 of 3 vendors third-party tested, COA purity 99–99.791% across published labs. Prices re-checked 1 hour ago.

As seen on

Where to buy GLP-1 (Semaglutide) online

We compare GLP-1 (Semaglutide) offers across vetted research vendors so you can buy with confidence. Every price above is pulled from a verified, in-stock listing — here's what to look for before you check out.

Compare vendors on price-per-mg rather than sticker price, and confirm a third-party Certificate of Analysis (COA) is publicly available before you buy. The comparison table above flags self-tested-only results and account-required vendors so you can filter those out first.

Stick to vendors with no unresolved legal issues or community warnings, and check that stock and pricing were verified recently — the "last checked" date on each listing tells you exactly when. Products listed here are intended strictly for laboratory research use.

GLP-1 (Semaglutide) Price Comparison

Compare GLP-1 (Semaglutide) prices across every verified vendor and supplier, ranked by price, purity, and buyer-rated trust. Use the tabs to filter by size.

Prices last checked Aug 6

Vendor	Rating	Stock	Purity	Value	Price
Prime Peptides primepeptides.co	4.6	In stock	99.681% COA	Good	$80.00
Modern Aminos modernaminos.com	3.0	In stock	No purity reported	Below average	$49.00
Sports Technology Labs sportstechnologylabs.com	4.7	In stock	99% COA	Below average	$174.99

Prime Peptides

primepeptides.co

Visit Prime Peptides

Value: Good
Price: $80.00
Last checked: 1h ago
Rating: 4.6
Stock: In stock
Purity: 99.681% COA
Verified
Community signal: Flagged
Reddit mentions: 0

Modern Aminos

modernaminos.com

Visit Modern Aminos

Value: Below average
Price: $49.00
Last checked: 1h ago
Rating: 3.0
Stock: In stock
Purity: No purity reported
Verified
Community signal: Flagged
Reddit mentions: 0

Sports Technology Labs

sportstechnologylabs.com

Visit Sports Technology Labs

Value: Below average
Price: $174.99
Last checked: 1h ago
Rating: 4.7
Stock: In stock
Purity: 99% COA
Verified
Community signal: Endorsed
Reddit mentions: 50

How to Store GLP-1 (Semaglutide)

Keep the dry powder frozen for the long haul, or in the fridge for up to three years. Once mixed with liquid, refrigerate and use within about a month. Pre-filled pens (like Ozempic or Wegovy) should be refrigerated before first use; after that, they can be kept at room temperature or refrigerated for up to eight weeks.

Lyophilized Storage

Desiccated at -18°C or below long-term; stable at 2–8°C for up to 36 months.

Reconstituted Storage

2–8°C for up to 28–30 days.

Pre-Filled Pens

Ozempic/Wegovy: refrigerate before first use; after first use, room temperature (up to 30°C) or refrigerated for up to 56 days.

Read the full storage guide

A smartphone displaying a "Storage Guide" for peptides, indicating a safe storage temperature range of 2–8°C, with warnings to keep away from light, heat, and freezing. The background is light blue, and additional tips on protecting the peptides are visible below the temperature range.

Compare GLP-1 (Semaglutide) Vendors

See which vendors and suppliers are trusted for GLP-1 (Semaglutide) — compare price, purity, and buyer trust signals side by side to find the best one to buy from.

Prime Peptides is operated by Prime Vitality, Inc. (Santa Barbara, CA), a WordPress/WooCommerce research-use-only (RUO) peptide vendor founded in July 2024. The company publishes per-batch Certificates of Analysis with verification keys for Janoshik-tested batches, but received a formal FDA warning letter in December 2024 for marketing GLP-1 peptides (semaglutide, tirzepatide, retatrutide) as unapproved new drugs despite RUO labeling.

Visit store

Sizes

Overview

Value: Good
Price: $80.00
Rating: 4.6(61)
Verified
Community signal: Flagged
Reddit mentions: 0

Testing & Purity

Purity: 99.681% COA
Testing: Third-party tested: yesCOA per batch: yesMass spectrometry: yes

Ratings

Purity accuracy: 4.3
Price value: —
Shipping speed: 4.6
Packaging: —
Customer service: 4.4

Buying

In stock
Account required
Payments: Card: yesPayment apps: noCrypto: noBank transfer: noOther: no
Ships to: United States
Last checked: 1h ago

Modern Aminos is a US research-use-only (RUO) peptide vendor requiring account login to view its full catalog. It advertises a multi-stage QA program with QR-linked, per-batch Certificates of Analysis, but an independent vendor reviewer (VialVerdict) reports that HPLC/COA data is actually available on request only and not standard practice — directly contradicting the vendor's own marketing. Independent lab aggregator Finnrick.com has only tested 5 samples (one product, Retatrutide), with 1 of 5 failing purity/fill standards.

Visit store

Sizes

Overview

Value: Below average
Price: $49.00
Rating: 3.0
Verified
Community signal: Flagged
Reddit mentions: 0

Testing & Purity

Purity: No purity reported
Testing: Third-party tested: noCOA per batch: noMass spectrometry: yes

Ratings

Purity accuracy: 1.0
Price value: 4.0
Shipping speed: 4.0
Packaging: 2.5
Customer service: 4.0

Buying

In stock
Account required
Payments: Card: yesPayment apps: yesCrypto: yesBank transfer: noOther: no
Ships to: United States
Last checked: 1h ago

Sports Technology Labs is a U.S.-based research chemical vendor founded in 2019 and headquartered in Shelton, CT, specializing in SARMs and peptides for in-vitro research purposes. The company was established to bridge the 'purity gap' in the research chemical industry by providing independently tested, high-purity compounds backed by publicly available certificates of analysis.

Visit store

Sizes

Overview

Value: Below average
Price: $174.99
Rating: 4.7(253)
Verified
Community signal: Endorsed
Reddit mentions: 50

Testing & Purity

Purity: 99% COA
Testing: Third-party tested: yesCOA per batch: yesMass spectrometry: yes

Ratings

Purity accuracy: 4.8
Price value: 4.3
Shipping speed: 4.8
Packaging: 4.4
Customer service: 4.7

Buying

In stock
Account required
Payments: Card: yesPayment apps: noCrypto: yesBank transfer: yesOther: no
Ships to: United States
Last checked: 1h ago

GLP-1 (Semaglutide) Dosage Guide for Weight LossGLP-1 (Semaglutide) Dosage Calculator

This is Semaglutide, a long-acting medication that helps control appetite and blood sugar. Dosing starts at 0.25 mg once weekly and steps up every four weeks: 0.25 → 0.5 → 1 → 1.7 → 2.4 mg, with most people settling at 1.7 or 2.4 mg. It's also available as a ready-to-use pen that doesn't require mixing with water, and as a once-daily pill.

Vial size

18 mg

Bacteriostatic water

3 mL

Dosing

0.25–2.4 mg (titrated)

Frequency

Weekly

Cycle

16+ weeks

Benefit

Weight Loss

Explore calculators

Basic Dosage Calculator

Calculate peptide doses with our visual syringe guide.

Peptide per vial

Target research quantity

Bac water added

How to reconstitute GLP-1 (Semaglutide)

View guide

The materials you'll need and step-by-step instructions for safely mixing GLP-1 (Semaglutide) with bacteriostatic water.

Materials needed

Your GLP-1 (Semaglutide) vial (lyophilized)

Alcohol swabs

Bacteriostatic sterile water

3 mL syringes (Luer Lock tip)

25G or 27G needles (Luer Lock). Other gauges may also be acceptable.

Sharps container (optional)

Remove the caps

Remove the caps from both your GLP-1 (Semaglutide) vial and your bacteriostatic water vial.

Sanitize the rubber stoppers

Wipe down the rubber stoppers on both vials with alcohol swabs and let them dry for about 3 minutes.

Attach the needle

Take your 3 mL syringe and needle. Twist the needle's plastic hub into the Luer Lock tip on the syringe to secure it.

Draw the bac water

Pull back on the plunger to draw your desired volume of bacteriostatic water. If you overfill, just push the excess back in until you reach the right marker on the syringe.

How much bac water? GLP-1 (Semaglutide) typically comes in a 18 mg vial. We recommend 3 mL of bacteriostatic water, though anywhere between 1 mL and 3 mL is acceptable. For larger vials you can use up to 5 mL — more bac water makes microdosing easier, but insulin needles usually max out at 1 mL per injection. That means a lot of bac water might force you into multiple injections to hit your target dose. Unless you're microdosing, 2 mL per vial is a solid rule of thumb.

Insert the needle into the GLP-1 (Semaglutide) vial

With the bac water in your syringe, insert the needle into the GLP-1 (Semaglutide) vial at a slight angle to avoid pressure buildup.

Use a thin needle: Stick to 25G or higher to avoid damaging the rubber stopper. Higher gauge means a thinner needle.

Release the water gently

Let the water run gently down the side of the vial. Don't inject it forcefully.

Heads up: Sometimes the plunger pushes itself in as soon as the needle enters the vial. Hold the plunger back so you have full control over how fast the bac water enters.

Swirl to dissolve

Avoid shaking. Gently swirl, flip, and roll the vial to dissolve the powder.

Be patient: This usually takes 2 to 5 minutes of consistent swirling, mixing in a circular motion, and gently flipping the vial up and down. The water needs to run through the powder many times to fully dissolve it. Don't shake or get aggressive with it.

Check for full dissolution

The solution should be clear with no visible particles. If it's cloudy or clumpy, wait a minute and repeat the swirling step.

Cap, dispose, and store

Once you're done, cap the needle and dispose of it (ideally in a sharps container). Store the reconstituted GLP-1 (Semaglutide) vial in the fridge whenever it's not in use. It will stay good for approximately 30 days.

How We Rank Offers

We don't just sort by price. Here's how each offer's rating actually gets calculated.

Compared Apples to Apples

We score price per mg against other offers of the same dose size, not the sticker price, so a bigger vial doesn't look like a worse deal than it is.

Price Is Only Part of the Score

We weigh price-per-mg alongside vendor rating, COA purity, and account requirements, so a cheap offer from an unproven vendor won't outrank a fair price from a trusted one.

Trust Gates the Top Ratings

A sub-4.0-rated vendor can't earn "Great value," and missing third-party purity data caps an offer out of "Good" or "Great." No price is low enough to buy around it.

Vendor Trust Signals

We don't sell GLP-1 (Semaglutide) ourselves — every vendor below is vetted and rated independently before being listed here.

Sports Technology Labs — 4.7/5 (253 reviews)

Public, third-party tested COAs on every batch, based in US, account required to view pricing.

Modern Aminos — 3.0/5

Based in US, account required to view pricing.

Compare all vendor reviews

GLP-1 (Semaglutide) Buying FAQ

Straight answers on legality, pricing, and vendor vetting before you buy. For research reference only.

Reconstitution involves injecting a measured amount of bacteriostatic (BAC) water into the vial along the glass wall (not directly onto the powder) to avoid damaging the peptide, then gently swirling — never shaking — until fully dissolved. The exact amount of BAC water used determines the final concentration (mg/mL), which is why researchers commonly use a reconstitution/dosage calculator to work out draw volumes for a target dose.

Published clinical research on semaglutide generally used a slow dose-escalation schedule starting around 0.25 mg weekly and titrating up over several weeks to a maintenance range often cited between 1.0 mg and 2.4 mg weekly, primarily to reduce gastrointestinal side effects. These figures come from clinical trial literature and are for research/informational reference only — they are not dosing instructions, and any handling of semaglutide vials should follow the supplier's research-use documentation.

The most frequently reported effects in clinical literature are gastrointestinal — nausea, vomiting, diarrhea, constipation, and abdominal discomfort — which tend to be dose-dependent and more common during dose escalation. Because these findings come from human clinical trials of approved pharmaceutical formulations, they are provided for research context only and are not a safety guarantee for research-grade compounds, which are not intended for human use.

Retatrutide is a newer, triple-receptor agonist (GLP-1, GIP, and glucagon), which in early trial data has shown larger average weight-loss effects than semaglutide, though it has a shorter research and safety track record. Semaglutide has substantially more long-term clinical trial history and regulatory approval behind it, while retatrutide remains earlier in its research and development pipeline.

In the US, semaglutide sold explicitly as a "research use only" (RUO) compound by a compliant supplier is generally legal to purchase for laboratory research, provided it is not marketed with therapeutic claims or sold for human consumption. Buyers should be aware this is a distinct legal category from prescription semaglutide (e.g., Ozempic, Wegovy) obtained through a licensed pharmacy, and RUO products are not evaluated by the FDA for human safety or efficacy.

Some research literature and anecdotal protocols reference combining GLP-1 agonists like semaglutide with other metabolic peptides (e.g., other GLP-1/GIP agonists) to study combined effects, but this is an active area of ongoing research rather than an established practice. Any such combinations carry compounded, poorly characterized risk profiles and should only be considered in the context of legitimate laboratory research, not personal use.