Best Dihexa Sources in the U.S.: Powder vs Capsules, Prices, and COA Checks
U.S. Dihexa listings range from single 5 mg research units to 60-count capsule bottles, so headline price alone is misleading. Compare format, verified milligrams, lot-specific testing, and current discounts before choosing a source.
Short Answer: Compare Dihexa by Format, Verified Milligrams, and Lot Proof
The best Dihexa source depends on two things: the format you need and how much proof supports the exact lot.
PeptidePub currently tracks a Purus Peptides 5 mg research unit at $89 and a BioEdge Peptides bottle with 60 capsules at 5 mg each, or 300 labeled mg total, at $129. Those package prices are not directly comparable.
With current catalog codes, Purus drops to $71.20 using peptidepub for 20% off. That is $14.24 per labeled mg. BioEdge drops to $116.10 using PEPTIDEPUB for 10% off, or about $0.39 per labeled mg. Shipping, tax, payment fees, inventory changes, and measured lot content can change the final comparison.
BioEdge leads on labeled value. Purus leads on product-specific proof because its current lot has quantitative content and purity results. An absolute winner requires both a delivered checkout total and an exact-lot Dihexa report.
Start with the live Dihexa price table, use the Dihexa guide to confirm identity, and compare testing depth in the vendor directory.
Dihexa, also called PNB-0408, is a modified angiotensin IV-derived research compound. Its evidence is preclinical, there is no controlled human efficacy trial, and key mechanism papers now carry integrity warnings or retractions. The practical buying question is still clear: choose the correct format, then pay for verified Dihexa milligrams rather than an ambiguous label.
Dihexa Sources and Prices at a Glance
Checked October 2, 2026.
| Seller | Format and quantity | List | Code and effective price | Labeled cost per mg | Product proof |
|---|---|---|---|---|---|
| Purus | 5 mg research unit | $89 | 20% peptidepub, $71.20 | $17.80 list, $14.24 after code | Current-lot Janoshik content and purity |
| BioEdge | 60 capsules x 5 mg, 300 mg total | $129 | 10% PEPTIDEPUB, $116.10 | $0.43 list, about $0.39 after code | Vendor-level evidence, no reviewed current-lot Dihexa report |
| American Peptides | Page says 60 x 5 mg, 300 mg total | $140 | Not cataloged | Unresolved | Claims lot-matched testing, no fetched report number or result |
| Selleck | Laboratory reagent, catalog E4606 | No public price | None | Not available | Batch E460601: 99.00% HPLC purity, NMR consistent with structure |
Purus names current lot DHX-005-PP-01 and says it is in stock, dispatches the same day before 1 PM EST, and ships free over $250.
American Peptides presents a contradiction. Its page says 60 capsules at 5 mg each but also displays “$140 / 5 mg.” Do not calculate cost per mg until the seller confirms whether $140 buys 5 mg or the full 300 mg bottle. The page also claims 99.9% purity, HPLC and mass-spec testing, same-day U.S. shipping, and free shipping over $300, but did not expose the current report.
Selleck is a laboratory benchmark, not a direct substitute. Compare tracked listings at Dihexa prices.
Powder vs Capsules: Why the Cheapest Milligram May Not Be the Best Fit
A small research unit and a 60-count capsule bottle solve different purchasing needs. Format changes the package size, handling, analytical expectations, and what price-per-milligram math can honestly tell you.
Purus represents its listing as a 5 mg research unit. BioEdge and American Peptides describe 5 mg capsules in 60-count bottles, which equals 300 labeled mg. A $129 bottle is not merely a slightly larger version of an $89 unit. Normalize the total labeled milligrams first. If a current-lot report includes quantitative content, replace the label claim with the tested amount for a more honest value calculation.
Dihexa is N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide, also called PNB-0408. Selleck lists CAS 1401708-83-5, formula C27H44N4O5, and molecular weight 504.66 g/mol. Its batch E460601 lists solubility of 100 mg/mL in DMSO and insolubility in water and ethanol. Selleck lists storage of three years at -20 C as powder, one year at -80 C in solvent, and one month at -20 C in solvent.
Those laboratory specifications do not make powder, capsules, sterile vials, and solvent stocks interchangeable. They also are not personal-use instructions. Confirm the exact format before comparing prices or interpreting a report.
Use the cost-per-dose tool only after confirming the format, capsule count, total milligrams, and measured current-lot content. The cheapest labeled milligram is useful only when the label and evidence describe the product actually being purchased.
What the Current Dihexa COAs Actually Show
| Evidence | Quantitative result | What it does not prove |
|---|---|---|
| Purus lot DHX-005-PP-01, Janoshik task 206354 | 4.60 mg Dihexa, 99.834% purity | Sterility, endotoxins, heavy metals, broad contaminants |
| Glacier lot DICAPGA-01, Ethos sample 26EA0903-074 | 5.22 mg per capsule, identity confirmed | Heavy metals |
| Selleck batch E460601 | 99.00% HPLC purity, NMR consistent with structure | Consumer bottle fill or delivered value |
Purus ordered testing July 9, Janoshik received the sample July 14, and analysis was conducted July 27, 2026. The 4.60 mg result is 0.40 mg below the 5 mg label, an 8.0% shortfall.
That changes the value math. The $89 list price is $19.35 per tested mg. After the 20% code, $71.20 divided by 4.60 mg is about $15.48 per tested mg, not $14.24. This is why purity and quantity must be read separately. A result can show 99.834% purity while the unit contains less material than labeled.
Glacier Aminos is not a publicly priced PeptidePub Dihexa offer, but its September 2026 report is a useful capsule example. Ethos received it September 4 and completed it September 9. Identity matched a certified reference standard under USP 621. The report found 5.22 mg per capsule against a 5 mg claim.
Microbiology passed: total aerobic plate, coliform, bile-tolerant gram-negative bacteria, and yeast and mold were each under 10 CFU/g. E. coli, Salmonella, and Staphylococcus aureus were negative per gram. However, arsenic, cadmium, lead, and mercury were explicitly not tested. Do not call this heavy-metal tested.
The Buyer Checklist Before Checkout
- Confirm identity. Require Dihexa or PNB-0408 and CAS 1401708-83-5. A generic nootropic blend is not equivalent.
- Match the lot. Purus lot DHX-005-PP-01 matches its Janoshik report. Never transfer a report across products, lots, or formats.
- Separate purity from quantity. Purus measured 99.834% purity but 4.60 mg in a 5 mg-labeled unit.
- Check capsule math. Sixty capsules at 5 mg each should equal 300 labeled mg. Confirm whether testing applies per capsule or to a composite sample.
- Compare delivered price per verified milligram. Include codes, shipping, tax, and payment fees. Review the seven testing fields, then check deals after the lot passes.
BioEdge’s reviewed vendor record scores six of seven fields using Kovera Labs and MDx BioAnalytical Laboratory reports. Additional contaminant or fentanyl screening is missing, and the reviewed reports cover other products rather than current Dihexa capsules.
BioEdge is therefore the value-led tracked option pending exact-lot evidence, not a proven current-lot winner. Ask for its Dihexa lot number and a matching report covering identity, content per capsule, purity, and relevant contamination testing.
For more detail, read how to review a COA, the underfilled batch guide, and the vendor testing guide.
What Buyers Should Know About the Dihexa Evidence
Dihexa is a stabilized angiotensin IV-derived peptidomimetic, but its evidence is not a clean human efficacy record.
The 2013 paper, PMID 23055539, reported oral activity, blood-brain barrier permeability, reversal of scopolamine-related deficits, findings in aged rats, and synaptogenic activity. PubMed links a 2021 Expression of Concern, PMID 34551989, to it. Treat this as a reported preclinical signal with an integrity warning.
The 2014 HGF and c-Met paper, PMID 25187433, was retracted in April 2025, notice PMID 40312093. A related 2012 HGF paper was also retracted in 2025, notice PMID 40312092. The repeated 65 pM HGF-binding claim and a proven c-Met mechanism are not established facts.
A 2018 systematic review, PMID 29733881, screened 450 records and included 32 non-human studies. In the broader angiotensin IV literature, 7 of 11 normal-animal studies and 8 of 9 cognitive-deficit studies reported beneficial cognitive-test effects from angiotensin IV or analogs. That supports research interest, not proof that Dihexa improves memory in people.
No controlled peer-reviewed human trial establishes Dihexa pharmacokinetics, cognitive benefit, interaction risks, or long-term safety. Buy on correct identity, current-lot content, and analytical proof. Use the full Dihexa evidence guide for the science, then return to source and price before checkout.
FAQ
Where can I buy Dihexa in the U.S.?
PeptidePub tracks Purus and BioEdge. American Peptides also lists it, but its page has a unit-label conflict. Check live Dihexa offers before buying.
Is Dihexa powder or capsules cheaper?
On October 2, 2026, BioEdge’s 300 mg capsule bottle was cheaper per labeled mg than Purus’s 5 mg unit. BioEdge was about $0.39 per labeled mg after code. Purus was $14.24 per labeled mg, or $15.48 per tested mg using its 4.60 mg result. Only Purus had current product-specific quantitative evidence in the reviewed material.
What is a good Dihexa price per mg?
Tracked after-code examples span $0.39 per labeled mg for BioEdge capsules to $14.24 for Purus. Compare within the format you need and substitute measured current-lot content when available.
What should a Dihexa COA show?
Require exact Dihexa or PNB-0408 identity, current lot, named laboratory, content per unit, purity, and format-relevant microbiological or contamination testing. Purity alone does not prove labeled milligrams.
Is Dihexa proven to improve memory?
No controlled human efficacy trial establishes that result. The record includes animal studies, a paper with an Expression of Concern, and retracted mechanism work. Buy based on product identity and analytical quality, not a guaranteed cognitive outcome.
Bottom Line: Buy the Format With the Strongest Proof per Dollar
BioEdge wins the tracked labeled-price comparison at about $0.39 per mg after code. Purus offers the clearest current product-specific quantitative report, but its adjusted value is about $15.48 per tested mg after code.
That makes BioEdge the value-led tracked option pending exact-lot evidence and Purus the proof-led tracked option. Do not crown an absolute winner until BioEdge provides a current Dihexa-specific report and both delivered checkout totals are confirmed.
Choose powder or capsules based on the research format first. Then compare verified milligrams, not an ambiguous package label. Before checkout, open the current Dihexa offers, compare vendor testing depth, review the seven-field methodology, normalize same-format value with the cost-per-dose tool, and apply current deals only after the lot passes.
Related Guides
- Best Research Peptide Vendors and Third-Party Testing
- How to Read a Peptide COA Before You Buy
- Peptide COA Underfilled Batch Guide
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