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The Protocol  ·  Weekly

Peptide science, in four minutes every Tuesday.

The peptide world is moving faster than the FDA. The Protocol gives you the truth. Backed by science and studies. Not trying to sell you a product. No vendor pitches. No magic-bullet claims. No fluff.

  • This week's biggest peptide story, decoded in plain language
  • A different compound covered in depth every issue, picked by readers
  • Three fresh studies with primary sources, a working community stack, and weekly vendor alerts
  • A deep cut on peptide history nobody else writes about, plus one health concept past peptides

You're in.

Check your inbox. First issue lands next Tuesday at 6 AM ET.

What you'll get

A weekly digest most labs charge for.

Every issue, same rhythm. Ten sections covering the science, the news, the stacks, and the things nobody else writes about. Four minutes to read. Save it forever.

01  ·  THIS WEEK IN PEPTIDES

The big story, decoded.

The most important news of the week: FDA pathway updates, Phase 3 readouts, policy moves. Neutral reporter tone, primary sources cited.

02  ·  PEPTIDE OF THE WEEK

One compound, picked by you.

Mechanism, half-life, who it's for, what people actually report. Built from reader replies. The most-requested peptide wins the slot every week.

03  ·  IN THE LAB

Three new studies, three sentences each.

Fresh peer-reviewed research, summarized tight, sourced to PubMed and journal names. The research curation you'd do yourself if you had the time.

04  ·  STACK SPOTLIGHT

A research framework and the science behind it.

A real research stack discussed in community literature: research goal, compounds covered, mechanism sequencing, and the published evidence each piece is built on.

05  ·  VENDOR WATCH

The trust layer.

Industry purity alerts, failed third-party tests, COA red flags. The section that gets The Protocol forwarded.

06  ·  DEEP CUT + READER Q + LONG GAME

The stuff nobody else bothers with.

Obscure peptide history, one reader question answered with first-name credit, and one non-peptide longevity concept that compounds over time.

A taste of Issue 001

Reta. The strongest GLP-1 ever tested.

This is what a real issue looks like. Issue 001 leads with Retatrutide's Phase 3 readout, three new studies you missed, a research stack discussion, a Vendor Watch on Reta purity, and a deep cut on glucagon's 100-year history. Subscribe to get the full issue plus everything that follows.

ISSUE 001  ·  THE PROTOCOL  ·  MAY 26, 2026

The strongest GLP-1 ever tested just hit 28.7%.

Plus three studies you missed, a stack the community is running right now, and the vendor red flag nobody's talking about.

THIS WEEK IN PEPTIDES  ·  3 THINGS WORTH KNOWING
1
Triple agonist. GLP-1 + GIP + Glucagon. Sema hits one, Tirz hits two, Reta hits all three.
2
Real cardiovascular signal. Top dose dropped systolic BP 14 mmHg, plus triglycerides, non-HDL, and hsCRP.
3
Not FDA approved yet. Earliest NDA filing is Q4 2026. TRIUMPH-1 anchor trial reads out Q2-Q3.

Full issue covers Peptide of the Week (Reta decoded), In the Lab (Tesamorelin, BPC-157, GHK-Cu studies), Stack Spotlight (a research framework discussion), Vendor Watch (Reta purity problem), Deep Cut (glucagon's 100-year history), Reader Q, and The Long Game (the free peptide).

Read the full issue →
The publisher

Written by a lab. Not by an affiliate marketer.

The Protocol is published by NLL Labs, a research peptide vendor with public third-party testing. The newsletter is free education, separate from the shop. Compounds get covered whether NLL carries them or not. Every claim has a citation. Every compound discussed has primary sources.

99.9%
Avg HPLC purity
FINNRICK A
9.1 / 10 across the line
MDx
HPLC + LC-MS at source
100%
Public COAs · every lot
On deck

Peptides on the radar, but you set the queue.

These are likely Peptide-of-the-Week candidates over the next two months. Subscribers vote with every reply. Most-requested compound wins the slot each Tuesday. If you want a peptide bumped to the front, hit reply.

001
Retatrutide
The triple-receptor agonist (GLP-1 / GIP / glucagon) at the center of recent Phase 3 readouts.
002
Tesamorelin
GHRH analog studied in visceral adipose tissue research literature.
UP
CJC-1295 with DAC
Long-half-life GHRH analog studied at the somatotroph axis.
UP
MOTS-c
Mitochondrial-derived peptide investigated in metabolic research.
UP
BPC-157 + TB-500
Two peptides studied in tissue and connective-tissue research literature.
UP
GHK-Cu
Copper tripeptide studied across dermal and signaling research.
UP
Kisspeptin-10
Hypothalamic peptide studied at the LH-pulse axis in research literature.
UP
Sermorelin
The classic GHRH analog. Long published research history.
Real questions

Things people ask before they sign up.

Short answers. No fluff.

Will you spam me?
No. One email per week, Tuesday at 6 AM ET. If you ever want out, one-click unsubscribe is in every email.
Is this just a sales funnel for NLL Labs?
No. The Protocol is pure education. No shop CTAs in the body. No discount codes. No featured products. We cover peptides NLL doesn't sell whenever readers ask. NLL Labs is the publisher, not the subject.
Will you give me dosing advice?
Not in the newsletter. We're not licensed practitioners. The Protocol covers science and frameworks. Specific dosing, timing, and cycle design require knowing your body and your goals, that's not a newsletter conversation.
Can I request a peptide to be featured?
Yes. Every issue ends with a "next week" prompt. Reply with any peptide you're curious about, including ones we don't sell. Most requested compounds get featured first.
Where can I see past issues?
Right here on this page once a few have shipped. Every issue gets a permanent link so you can share or revisit anytime.
What if I'm new to peptides?
Perfect. The Protocol is written for the curious, not just the experienced. Plain English first, technical depth where it matters.

The peptide newsletter most labs won't write.

Ten sections, four minutes, every Tuesday at 6 AM ET. Pure education, published by a lab with public lab reports. Free forever.

You're in.

Check your inbox. First issue lands next Tuesday at 6 AM ET.