Longevixx publishes a monthly figure beside all twenty of its peptide programs, and it is the only seller here carrying PT-141, epitalon or semax. Eight of the twenty are combination vials, and three of the compounds it is unique for are among them.
By Nora Castellan, Standards Editor · Updated September 2026
Why this one matters more than its size suggests
Longevixx is the only provider compared on this site that sells PT-141, epitalon and semax at all. No other seller in this comparison stocks any of the three.
That is a coverage fact, not a compliment. The menu is broad because the company sells across recovery, longevity, sleep, immunity, cognition and sexual health at once, and breadth of that kind is easier to advertise than to stand behind.
The brand is spelled Longevixx and the website is startlongevix.com. A shopper typing the brand name into a browser will not land on it, which matters when checking whether a page belongs to the company it claims to.
Every program carries a price, and that is unusual here
The peptide catalog lists twenty programs and prints a monthly figure on every card. Most sellers in this category publish a single headline rate and leave the rest of the menu blank.
Each figure is a starting rate. The catalog does not say what moves a program above its floor, so the published number is the least a buyer can pay rather than what they will pay.
The homepage adds two structural terms worth having: plans are confirmed after a provider review, and a request that is turned down is not charged.
The combination problem, which is the real caveat
Eight of the twenty programs are combination vials rather than single peptides. Semax is sold only as a semax and selank pairing. TB-500, KPV and CJC-1295 are each sold only inside a multi-peptide vial.
So the semax figure above is the price of a two-peptide product, and the KPV figure is the price of a three-peptide one. Each one says so in the qualifier beside the number, because a combination price printed bare would quote a rate for something the company does not sell.
Epitalon and PT-141 are the exceptions among the compounds this seller is unique for. Both are sold standalone, and both carry their own figure.
The catalog spells epitalon as epithalon. That is a common alternative spelling for the same compound, and the price rows here keep the seller's own wording attached.
What the terms actually commit to
The terms of service name Longevixx LLC as the owner and operator of startlongevix.com, which is how the domain is confirmed rather than assumed.
Service is limited to the states where the company operates, and the terms never list them. A shopper cannot check coverage before starting an assessment.
The company describes itself as a platform that connects patients to independent licensed practitioners and state-licensed compounding pharmacies, and says it does not itself prescribe or dispense. The pharmacies are not named.
The site also states plainly that compounded medications are not FDA approved and that their safety, efficacy and quality have not been independently verified by the agency. That disclaimer is easy to miss and worth reading.
Who it's for
Buyers looking for PT-141, epitalon or semax, which almost nothing else in this comparison sells.
Anyone who wants a published monthly figure on every item in a catalog rather than one headline rate.
Shoppers who want to know before starting that a declined request carries no charge.
People comparing several peptides at once who would rather read one menu than five.
Who should look elsewhere
Anyone who needs semax, KPV, TB-500 or CJC-1295 on its own, since each is sold only inside a combination vial.
Buyers who need to confirm their state is covered before signing up, because no state list is published.
Shoppers who want the compounding pharmacy named, which this site does not do.
Anyone shopping for glutathione, which is not on this catalog.
People budgeting from the published figure, since every one of them is a floor rather than a fixed rate.
Strengths
Publishes a monthly figure beside every one of its twenty peptide programs, not a starting price for the catalog as a whole
The only seller here listing PT-141, epitalon and semax, three compounds nothing else on this roster carries
Charges nothing when a request is turned down
Trade-offs
Semax, KPV, TB-500 and CJC-1295 are sold only inside combination vials, so the figure beside each is the price of a pairing rather than of that peptide alone
Its terms limit service to the states where the company operates without naming them, so coverage cannot be checked before signup
The compounding pharmacy that fills prescriptions is not named on the site
Every figure is a starting rate, and the catalog does not say what moves a program above it
How we verified this
Read the full peptide catalog at startlongevix.com/peptides and recorded the monthly figure printed on each of the twenty program cards.
Confirmed which programs are single peptides and which are combination vials, and attached that distinction to every price recorded here.
Confirmed from the terms of service that Longevixx LLC owns and operates startlongevix.com, rather than matching the brand name to a domain.
Checked the terms for a state list and found service limited to the states where the company operates, with none named.
Requested a nonsense path on the same host in the same session; it returned a not-found response of a different size from the pages read, so the pages read are real pages.
A provider to compare Longevixx against
Trellis Vitality
Trellis Vitality frames its program around body-composition tracking rather than scale weight, pairing NAD+, glutathione and tesamorelin with at-home biomarker panels and a 90-day re-test, and names its dispensing pharmacy, VialsRX in Houston, by address.
Among the providers compared here, Longevixx is the only seller carrying semax, and one of two carrying epitalon. That is a statement about this comparison, not about the whole market.
Why does the semax price look higher than the others?
Semax is not sold on its own. The figure is for a semax and selank combination vial, which is a different product from single-peptide semax and is priced as one.
Which states does Longevixx serve?
The terms limit service to the states where the company operates and do not name them. There is no published list to check against before starting an assessment.
Is the published price what I will pay?
It is the floor. Every figure on the catalog is a starting rate, and the page does not explain what raises a program above it. Confirm the number during the assessment.
Who fills the prescription?
The site says a state-licensed compounding pharmacy does, and does not say which one. A buyer cannot look up the pharmacy before ordering.
Longevixx is not a paid partner; this link may earn a commission if that changes. Full disclosure.