TB-500 for Dogs Dosage Chart — Amounts by Weight

TB-500 amounts for dogs are scaled to body weight, and on the K9-REPAIR label the reconstituted formula is referenced in insulin-syringe units: 10 units for dogs under 20 lbs, 15 units for dogs 20–55 lbs, and 20 units for dogs over 55 lbs. Because 10 units equals 1 mg of each compound after mixing, those reference amounts work out to roughly 1 mg, 1.5 mg and 2 mg of TB-500 — and the same of BPC-157 — per draw. Those are the label's weight-scaled reference amounts, not a prescription for your dog, and the right approach for any individual animal is a conversation to have with your veterinarian first.

This page exists because TB-500 dosing questions keep resolving to human bodybuilding forums, where the math, the body mass and the goals have nothing to do with a limping retriever. Below is how the weight scaling actually works, how to read the syringe, and why TB-500 and BPC-157 are described differently in the research literature even when they come in the same vial.

Why body weight is the only input that sets the amount

Peptides are dosed the way most weight-sensitive veterinary compounds are dosed: by the size of the animal receiving them. A 12-pound terrier and a 90-pound shepherd have very different blood volumes and very different tissue mass to distribute a compound through, so the same measured amount means something entirely different in each of them.

What does not set the number is the problem you are worried about. A chart cannot and should not scale an amount up because a tendon tear looks severe or down because a limp looks mild. The number comes from your dog's weight and your veterinarian's judgement — never from a diagnosis, a forum post, or a human protocol scaled down by eye.

This matters more than it sounds. The single most common mistake owners make when they go looking for a TB-500 dosage for dogs is to find a chart written for a 200-pound human athlete and divide. Human peptide protocols assume different body composition, different administration habits, and a user who can describe how they feel. Your dog cannot. Weight-scaled reference amounts designed for canine use are a different starting point entirely.

The weight-scaled reference amounts on the K9-REPAIR label

K9-REPAIR from pawgen is a combined BPC-157 and TB-500 formulation. Once it is reconstituted according to the label, the measurement works out cleanly: 10 units on a standard insulin syringe equals 1 mg of each compound. Here is how that scales:

Dog's body weight	Label reference amount	Approximate amount of each peptide
Under 20 lbs	10 units	~1 mg TB-500 + 1 mg BPC-157
20–55 lbs	15 units	~1.5 mg TB-500 + 1.5 mg BPC-157
Over 55 lbs	20 units	~2 mg TB-500 + 2 mg BPC-157

A standard insulin syringe is marked in 100 units across 1 ml, so each unit is one-hundredth of a millilitre. That is why the graduations matter: on a 1 ml syringe, 15 units is a small, precise line, not an eyeballed partial fill. If you have only ever measured liquid supplements with a dropper or a kitchen spoon, the first thing to do is look at the barrel markings in good light and find the line you are aiming for before you draw anything.

The full reconstitution and measurement walkthrough — including how the formula is mixed and stored — lives in the pawgen dosing guide. Read it alongside the label, and confirm with your veterinarian that the reference amount for your dog's weight band is appropriate given everything else going on with that specific animal.

What TB-500 does, and why its rhythm differs from BPC-157

TB-500 is a synthetic peptide related to thymosin beta-4, a naturally occurring actin-binding protein found in most mammalian cells and present at high concentration in platelets and in wound fluid. The mechanism described in the research literature centres on actin regulation: thymosin beta-4 sequesters G-actin, which influences how cells build and dismantle their internal scaffolding — and therefore how readily they migrate. Research also describes roles in angiogenesis and in the inflammatory signalling that accompanies tissue remodelling. Early evidence indicates these are systemic, migration-and-vascularity effects rather than a single localised action.

BPC-157 comes from a different place. It is a partial sequence of a protein identified in gastric juice, and research describes it in terms of angiogenic signalling, growth factor pathways and tendon fibroblast behaviour — effects that are often studied at or near the site of injury.

That difference in character is why the two compounds are described with different cadences in research settings. TB-500 is the larger molecule, and the literature commonly discusses it as a loading-then-maintenance pattern. BPC-157 is typically described with steadier, more consistent administration. In a combined formulation like K9-REPAIR, that scheduling question is exactly the thing to work through with your veterinarian rather than lift from a chart.

	TB-500	BPC-157
Origin	Synthetic peptide related to thymosin beta-4	Partial sequence of a gastric juice protein
Molecule size	Larger	Short-chain
Mechanism discussed in research	Actin sequestration, cell migration, angiogenesis	Angiogenic signalling, growth factor pathways, fibroblast activity
Cadence described in literature	Loading pattern, then maintenance	Steadier, more consistent administration
Scaled by	Body weight	Body weight

Neither compound is an FDA-approved veterinary drug, and nothing here describes a treatment for a condition. What owners report, and what draws them to the combination, is the complementary mechanism — one peptide studied largely for systemic migration and vascular signalling, one studied largely for local repair signalling, scaled together to the dog in front of them. That is the stack a growing number of owners use through a recovery window, and the science behind it is genuinely interesting and moving quickly.

Dogs who should never get a number from a chart

Some dogs fall outside what any published reference amount can responsibly cover, and this is where a chart has to stop talking:

• Puppies and still-growing dogs. Growth plates, changing body weight and developing physiology mean a weight band from a chart is not a safe substitute for veterinary input. There is no number here for them.
• Pregnant or nursing dogs. Same answer, and it is not a hedge: this is a veterinarian conversation, full stop.
• Dogs on prescription medication. If your dog is on carprofen, Rimadyl, gabapentin, prednisone, Librela or anything else a vet prescribed, nothing on this page is a reason to change, reduce or stop it. Prescriptions are your vet's call and your vet's alone.
• Dogs with a surgery date. Orthopaedic surgery for a torn CCL, a fracture or a severe tendon injury is the intervention that restores mechanical stability. Nothing taken by mouth or by syringe replaces it. Peptides occupy the space around a proper surgical and rehab plan, not instead of one.
• Dogs with liver, kidney or metabolic disease. Any compound that circulates deserves a clearance conversation with the clinician who knows the bloodwork.

If your dog is in any of those categories, the honest answer to "what's the TB-500 dosage for dogs my dog's size?" is: book the appointment and ask the person who can examine them.

How to judge a peptide label before you judge the peptide

The peptide category has a quality problem, and it is worth pointing the skepticism in the right direction. Plenty of joint products on the shelf are kitchen-sink chews — fourteen ingredients on the panel, proprietary blends hiding how little of each is actually present, and a label designed so you cannot do the math. That is a label problem, not a biology problem.

So apply the test to the paperwork:

• Is the amount per unit stated plainly? You should be able to calculate exactly how much of each compound is in a draw. With K9-REPAIR, 10 units equals 1 mg of each — that is a number you can check.
• Is there third-party testing with a certificate of analysis you can actually read? Identity and purity testing by an independent lab is the difference between a stated formulation and a verified one.
• Is the formulation canine-specific? Weight bands written for dogs, not a human vial repackaged with a new sticker.
• Does the company stand behind it? pawgen ships direct to the door and backs K9-REPAIR with a 60-day money-back guarantee.

A brand that publishes its numbers invites you to check them. That is the standard worth holding every product to, including this one.

Key Takeaways

• TB-500 amounts for dogs are scaled by body weight, never by condition or injury severity.
• On the K9-REPAIR label, reconstituted product is referenced at 10 units (under 20 lbs), 15 units (20–55 lbs) and 20 units (over 55 lbs) on a standard insulin syringe.
• 10 units equals 1 mg of each compound; 100 units equals 1 ml on a standard insulin syringe.
• TB-500 and BPC-157 are described with different cadences in the research literature — TB-500 as a loading-then-maintenance pattern, BPC-157 as steadier administration.
• Human TB-500 charts do not scale down cleanly to dogs and should not be used as a starting point.
• Puppies, pregnant or nursing dogs, and dogs on prescriptions get a veterinary conversation, not a chart number.
• BPC-157 and TB-500 are not FDA-approved veterinary drugs; all of this is educational.

Where the chart ends and your veterinarian begins

A dosage chart answers one narrow question — how an amount scales to a dog's size. It cannot tell you what is wrong with your dog, whether the limp is a partial cruciate tear or a soft-tissue strain, whether imaging is needed, or whether surgery is the right call this month. Your veterinarian owns the diagnosis and owns the treatment plan: the imaging, the prescriptions, the surgical decision, the rehab protocol and the timeline for returning to normal activity. Bring the label to that appointment and talk it through the way you would any other addition to your dog's routine. Peptides work in the space that proper veterinary care creates — they do not substitute for it, and the best outcomes come from owners who use both.

To check what is in the vial, the independently issued certificates of analysis are published in full; shipping and availability details are on the location page, and the K9-REPAIR formulation itself is listed in the shop.

Owners exploring peptide support for their dog can review K9-REPAIR — BPC-157 + TB-500 formulated for dogs — at https://pawgen.com/. BPC-157 and TB-500 are not FDA-approved veterinary drugs. Nothing in this article treats, cures or prevents any condition; every decision about your dog's care belongs with your veterinarian.