Research‑gradepeptides. USA‑made.

Product guideCodex Research4 min read

Metered Pump Sprays: Why Every Press Matters

A metered pump is the part of a spray bottle that decides how much liquid leaves with each press. On a research spray, it is the difference between a repeatable sample and a guess.

How a metered pump works

Inside the actuator is a small chamber and a pre-compression valve. The chamber holds a fixed volume. When the actuator is pressed all the way down, the valve opens only once pressure builds, so the whole chamber empties as an even mist. Releasing the actuator refills the chamber for the next press.

Because the chamber size sets the volume, a full press delivers the same amount whether it is pressed fast or slow.

Why it matters in research

• Repeatability. Each actuation matches the last, so samples are comparable across a session.
• Less handling. No drawing or measuring by hand, which removes a common source of variation.
• Closed system. The solution stays sealed between presses instead of being opened and exposed.

Metered pump vs other methods

Getting consistent results

1. Prime it. Before first use, press a few times away from your work area until a steady, even mist appears.
2. Hold it upright. The dip tube needs to sit in the liquid to fill the chamber fully.
3. Use a full stroke. Press all the way down in one motion. Partial presses deliver partial volume.
4. Cap and store as labeled. Keep the cap on between uses and follow the storage line on the label.
5. Re-prime after storage. If the bottle has sat for a while, one or two presses resets the chamber.

Lab testingCodex Research5 min read

What Lab Testing Actually Checks

"Lab tested" only means something if you know what was tested and who tested it. Here is what each test on a Codex certificate tells you.

How the testing works

Every batch is lab tested before it ships. Each test is run against a set specification, and the certificate shows the result, the method and a pass for every line.

The tests, one by one

Lab tested vs untested

What to look for

• A clear pass or fail for every test.
• A lot number that matches your bottle.
• A test date that comes after the batch was made.
• The method listed next to each result (HPLC, MS).

QualityCodex Research3 min read

How to Read a Batch-Matched COA

A certificate of analysis is only useful if it belongs to the exact batch in your hands. Every Codex bottle carries a lot number that points to one certificate.

Check it in under a minute

1. Find the lot number. It is printed on the bottle label.
2. Scan the QR code on the label, or look the lot up on the COA page.
3. Match the lot. The lot on the certificate must be identical to the one on your bottle.
4. Match the product. Compound name and format should match what you ordered.
5. Read the results. Purity, identity and contaminant results with a pass result and test date.

Anatomy of the certificate

Red flags on any COA

• No lot number, or one that does not match the bottle.
• No pass or fail result.
• A test date before the product was made.
• A purity number with no method beside it.
• The same certificate shown for every batch.

SourcingCodex Research5 min read

US-Made vs Imported Peptides: What Changes

Where a compound is made shapes how long it travels, what it is exposed to on the way, and how easily its history can be traced. Codex sprays are produced, tested and shipped in the United States.

Side by side

Why transit matters

Peptides are sensitive to heat and time. A shorter, domestic route means fewer days in trucks and warehouses and fewer chances for a shipment to sit in an unconditioned space.

Why traceability matters

When a product is imported in bulk and relabeled, the link back to the original batch is often lost. A US-made, lot-labeled bottle keeps that link from production to your shelf.

StorageCodex Research4 min read

How to Store Research Sprays

A research spray is only as consistent as the way it is kept. Most variation between the first press and the last comes from heat, light and air, not from the bottle itself.

The three things that matter

• Temperature. Keep the bottle refrigerated at 2–8 °C unless the label says otherwise. Avoid freezing, which can affect the solution and the pump seal.
• Light. Store the bottle in its box or a dark drawer. UV and strong daylight degrade many peptides over time.
• Air. Keep the cap on between uses. The pump stays sealed, but the actuator tip should not sit open.

Storage at a glance

When your order arrives

1. Unpack the same day. Move the bottle to the refrigerator as soon as the box arrives.
2. Check the lot. Match the lot number on the label to its COA before first use.
3. Prime before first use. A few presses away from your work area until the mist is even.
4. Note the open date. Write it on the box so you know how long the bottle has been in use.

FormatsCodex Research5 min read

Sprays vs Vials: Choosing a Format

Vials and metered sprays hold the same compounds. The difference is everything that happens between opening the package and taking a sample.

How each format works

A vial usually holds a lyophilized (freeze-dried) powder that has to be reconstituted with a diluent, then drawn and measured by hand for each sample. A metered spray arrives already in solution, and the pump delivers a fixed volume with every full press.

Side by side

When to choose which

• Choose a spray when repeatability and fewer handling steps matter most, or when many small identical samples are needed.
• Choose a vial when you need long-term storage of unopened stock or custom volumes for each experiment.

ShippingCodex Research4 min read

How We Ship: Same-Day Dispatch

Peptides don't like waiting around. So we don't let them. Every order placed before 3 PM ET on a business day is packed, sealed and handed to the carrier the same afternoon,.

From click to doorstep

1. You orderPayment clears and your order drops into the dispatch queue instantly.
2. 3 PM ET cutoffAnything in before the cutoff ships today. After it, first out tomorrow morning.
3. Packed coldInsulated mailer, cold packs and foam-cut slots so nothing shifts in transit.
4. Handed offSealed, labeled and with the carrier the same day. Tracking hits your inbox.
5. DeliveredTracking updates all the way to your door, so you know exactly when to be home.

How every box is packed

• Insulated mailer. A thermal liner slows heat transfer on hot trucks and cold porches.
• Cold packs. Added to every order so the contents stay cool through transit.
• Foam-cut slots. Vials and sprays sit snug, upright and separated, so nothing knocks or leaks.
• Lot labels out. Each bottle ships with its lot number facing up, ready to match to its COA.

Shipping options

When your box lands

1. Bring it inside. Don't let it sit on the porch. Open it the day it arrives.
2. Refrigerate first. Move vials and sprays to 2–8 °C before you do anything else.
3. Match the lot. Scan the QR or check the lot number against its COA.
4. Something off? Damaged or warm on arrival, message us with a photo within 48 hours and we'll make it right.

PurityCodex Research4 min read

Why 99% Purity Matters

“Purity” is the share of a sample that is the exact peptide on the label. A few percent sounds small. In research, that few percent is an uncontrolled variable in every experiment you run.

What the number actually measures

Purity is measured by HPLC. The sample is separated, and each compound shows up as a peak. The target peptide is the main peak; purity is its share of the total peak area. One tall, clean peak means one dominant compound.

What is in the other few percent

• Truncated or deletion sequences. Chains missing one or more amino acids from synthesis.
• Modified forms. Oxidized or otherwise altered versions of the peptide.
• Synthesis leftovers. Residual reagents and by-products not fully removed.

The difference in real numbers

Going from 95% to 99% cuts the unknown material by about five times.

Why it matters for your research

1. Fewer variables. Less unknown material means results reflect the compound you meant to study.
2. Repeatable results. High, consistent purity lot to lot lets you compare experiments over time.
3. Cleaner data. Impurities can interfere with assays and make results harder to read.

How to check it yourself

• The COA names the method (HPLC) beside each result.
• The lot on the certificate matches the lot on your bottle.
• The chromatogram shows one dominant peak.

QualityCodex Research4 min read

What Endotoxin Testing Means

Endotoxins are fragments of bacterial cell walls. They are invisible, survive heat that kills bacteria, and can skew research results, so a clean lot is tested for them directly.

How the test works

The standard method is the LAL (Limulus Amebocyte Lysate) assay. A reagent that reacts to endotoxin is mixed with the sample, and the reaction is measured against known standards to give a result in endotoxin units per millilitre (EU/mL).

Reading the number

• Result. The measured level in EU/mL. Lower is better.
• Limit. The maximum allowed for that product. The result must fall below it to pass.
• Method. The assay used, such as kinetic chromogenic LAL. It tells you how the number was produced.

What a complete COA shows

Every Codex lot is endotoxin lab tested, and the result is printed on the COA you can scan from the bottle.