Modern Aminos Alternatives: The Best Second Source in 2026

Modern Aminos has earned its regulars. It has shipped since January 2023, stayed open while Amino Asylum went dark and Peptide Sciences, Strate Labs and Eternal Peptides closed, and the people with years of orders behind it mostly stay out of trust. Simms Research’s review of Modern Aminos tells that story and walks through its test record.

A few things still send those buyers looking for a second supplier. The regulars who drift away tend to leave over price, not quality. Its delivery promise ends at the carrier’s “delivered” scan, so a box that is marked delivered and never found is not reshipped free. And its FAQ says plainly that it gives no usage guidance, which leaves newer buyers to work out mixing on their own. None of that makes it a worse shop than it was a year ago. It does make the question practical: who else carries retatrutide, tirzepatide and the repair blends at a fair price, with lab numbers behind the vial and cover all the way to the door.

The standard a second supplier has to meet

A Modern Aminos regular has a clear standard, set by what that shop does well: the compound on the label with a batch report behind it, a box that ships the day it is ordered, and a price that doesn’t punish a repeat order. Anything that replaces it, even for part of an order, has to meet that standard on five points: what is in the vial, what it costs at the sizes people actually buy, how the box gets to the door and the fix if it never arrives, how checkout and support work, and whether there is help with mixing and dosing.

Simms Research takes that list one point at a time. Its shelf is narrower than a one-stop shop’s, all freeze-dried peptides, and deepest exactly where a GLP regular shops: retatrutide and tirzepatide in four sizes to 60mg, plus GHK-Cu, BPC-157, TB-500 and three blends made from them.

Who Simms Research is

Simms Research is a US research peptide supplier, and nearly everything it claims is open to checking. An independent ISO-certified lab runs its batch testing, and results for 23 compounds are public in its lab results library, each linked from its product page. Its phone line, 855-592-8507, is staffed on weekdays between 9 and 5 Eastern, and email to support@simmsresearch.com usually gets an answer within one business day. A written delivery guarantee comes free with each order, spelled out in its shipping policy.

What it offers a Modern Aminos regular is a second, documented source for the compounds that matter most to them.

The lab numbers behind a Simms vial

Four compounds from Modern Aminos’ own best-seller shelf are on Simms’s too, and the latest Simms batch of each tested above 99.6% purity, held at least its labeled amount and passed endotoxin and heavy metal screens with no microbial growth. Each was checked across three vials, with identity confirmed by LC-MS:

Earlier batches stay on record next to the current one: six for Retatrutide (GLP-3) going back to October 2025, five for BPC-157. Each batch in the library opens its full certificate, and how to read a peptide COA explains what every field means.

Modern Aminos describes its own batch testing as purity, identity, quantity and endotoxins. Simms’s July batches cover those four and add a heavy metal screen and a microbial test, and each report prints how many milligrams the lab actually found next to the purity figure.

Modern Aminos vs Simms Research on price

On retatrutide the two shops match at 10mg, and Simms Research is $20 to $40 cheaper on every larger vial. Simms also sells tirzepatide up to 60mg, past Modern Aminos’ largest vial. Here are the list prices on both stores on October 16, 2026, for the compounds both sell where Simms is level or ahead:

The big vials are where the difference grows. A 60mg Retatrutide (GLP-3) vial at Simms comes to about $4.32 a milligram, and the 60mg Tirzepatide (GLP-2) vial to $3.10. On top of the list price, every Simms order earns points toward free products, covered below.

Delivery, and the box marked delivered

Simms orders placed before 5 p.m. Eastern ship the same day, and on weekdays that cut-off falls at the very moment of Modern Aminos’ 4 p.m. Central one. Two carriers are offered: FedEx 2-Day, free once an order passes $200, and UPS Standard, which takes three to five business days. Orders go to every US state and overseas.

Where the two part ways is the doorstep. Every Simms box is covered by its Free Delivery Guarantee, which costs nothing and needs no add-on. If the parcel vanishes in transit, disappears after the carrier scans it as delivered, or turns up damaged, Simms sends the products again free, or refunds them along with the shipping. The buyer never files a carrier claim; Simms takes that up itself. Late parcels and customs holds aren’t part of it.

Modern Aminos reships free when the carrier confirms a parcel was never delivered. When tracking says delivered, its policy treats its delivery guarantee as fulfilled and asks the buyer to search the porch, the mailroom and the neighbors. For anyone whose packages sit outside during the day, that is the line that matters most.

A wrong or faulty item gets the same treatment when it is reported to Simms with photos inside 48 hours, as its refund policy sets out.

Paying, signing in and reaching support

At a Simms checkout a buyer can pay with any of the four big card brands (Visa, Mastercard, Amex, Discover), tap Apple Pay or Google Pay, split the total with Klarna, or send it by Venmo, and none of them adds a surcharge. Modern Aminos lists Visa, Mastercard and Amex cards, a same-day bank payment and Bitcoin. How each Simms option works is laid out on its payment options page.

Signing in at a Simms checkout means typing an email address and entering the one-time code it receives; there is no password to make up. That account keeps the order history and the rewards balance.

For help, Simms answers by phone as well as by email during weekday office hours, with both listed on its contact page. Modern Aminos handles support through email and its contact form, with partial weekend cover, and lists no phone number.

Mixing and dosing help

Modern Aminos’ FAQ states that it gives no research or usage guidance. Simms Research publishes that help openly, which matters most to buyers who are newer to freeze-dried peptides. Its peptide calculator works with any vial size, including a 12mg MA-3RT or 40mg MA-2TZ vial already in the fridge. The retatrutide dosage guide and tirzepatide dosage guide put each step in syringe units, and a step-by-step reconstitution guide covers mixing the vial itself.

The water can go on the same order: Research Water is bacteriostatic water with 0.9% benzyl alcohol, $20 for 10mL.

Moving an order from Modern Aminos

Moving over is mostly a matter of names. Modern Aminos sells its weight-research compounds under house codes; Simms uses the compound name, with the market nickname beside it, so retatrutide is sold as Retatrutide (GLP-3). Here is how the overlap maps:

The product pages are Retatrutide (GLP-3), Tirzepatide (GLP-2), GHK-Cu, the Wolverine Peptide Stack, the Glow Peptide Blend and the Klow Peptide Blend, each with its current batch report a click away.

The simplest first order mirrors the last one placed at Modern Aminos: the same compound, often one size up now that the larger vials cost less, with Research Water if the bottle at home is running low. Past $200, FedEx 2-Day is free.

Points don’t move between shops, so Simms Rewards opens a fresh balance, with 100 points when the first order is placed and five more for each dollar spent on products after that. The points are traded for free vials, retatrutide and tirzepatide included, that ride along on a later order.

Other Modern Aminos alternatives

Simms isn’t the only shop a Modern Aminos buyer weighs. Four others Simms Research has reviewed, picked for that buyer:

Swiss Chems

Trading since 2018, it is the closest match for the part of a Modern Aminos order that goes beyond peptides, with a wide shelf and a checkout that works from almost anywhere. Simms Research’s Swiss Chems review covers its record.

Amino USA

A Texas shop since 2023, priced in the middle of the market, that suits buyers who want someone to pick up the phone. Simms’s Amino USA review covers what its regulars and testers report.

Simple Peptide

A Florida family business that launched fully in late 2023, priced above the budget end, for buyers who put speed and support ahead of price. The Simple Peptide review covers its turnaround in testing.

Amino Club

A newer store, opened in early 2026, that sells the common research peptides. The Amino Club review covers its orders, lab reports and terms.

Which Modern Aminos alternative fits

For the compounds most Modern Aminos buyers come for, Simms Research is the alternative that meets every buying point: retatrutide at the same price at 10mg and $20 to $40 less above it, tirzepatide up to 60mg, batch reports with measured content and contaminant screens, cover that runs past the delivery scan, a phone line and dosing help. Modern Aminos keeps the cases it truly owns:

The full range is in the Simms Research shop, each product beside its batch report.

Frequently asked questions

What is MA-3RT called at Simms Research?

Retatrutide (GLP-3), in four vial sizes from $84 for 10mg to $259 for 60mg. MA-2TZ is Tirzepatide (GLP-2): $65 at 10mg and $186 at 60mg.

Is Simms Research legit?

Yes. It publishes batch results from an independent ISO-certified lab for 23 compounds, staffs a support phone on weekdays and puts its Free Delivery Guarantee in writing for every order.

Why does Modern Aminos ask me to log in now?

Modern Aminos asks visitors to register or log in before its full catalog shows, which it describes as part of its compliance commitment. Registering asks for an email, a password, a business type and agreement to its terms.

How fast does Simms Research ship compared with Modern Aminos?

On weekdays the two share a cut-off in real time: 5 p.m. Eastern at Simms, 4 p.m. Central at Modern Aminos, with same-day dispatch before it at both. Simms’s FedEx 2-Day usually takes two business days and costs nothing over $200.

Modern Aminos vs Peptide Sciences: which is still open?

Modern Aminos is still trading. Peptide Sciences closed its store on March 6, 2026, and its buyers scattered to the shops that remained.

Is there a discount code for Modern Aminos buyers?

No. Nothing in this comparison is a code or an affiliate link, and every Simms price quoted is its everyday list price.