LOY-001 for Dogs: The Large-Dog Injection, IGF-1 and FDA Status

What Loyal is testing for big dogs, what its FDA milestone means, and how a daily healthy-aging formula serves a different purpose.

By La Petite Labs Editorial 12 min read

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Woman hugging a golden retriever while holding a Hollywood Elixir box
Contents

LOY-001 is Loyal’s investigational injection for large and giant dogs. It is designed to lower IGF-1, a signal involved in growth, to test whether changing that biology can extend healthy lifespan. Loyal currently describes the intended group as dogs aged seven or older and weighing at least 40 lb. As of October 6, 2026, the company still describes LOY-001 as a drug in development; its 2023 FDA effectiveness milestone was not permission to sell it. Loyal’s current product information

This guide explains the science and the practical questions separately. It also explains Hollywood Elixir’s nutritional design for owners considering a healthy-aging supplement. La Petite Labs makes Hollywood Elixir and publishes this guide; we are not affiliated with Loyal.

What is LOY-001?

LOY-001 is a veterinary drug candidate being developed to address the shorter average lifespan associated with large body size in dogs. Loyal’s proposed format is a long-acting injection given by a veterinarian a few times a year. It is not an owner-administered supplement or a daily pill. Product overview

The ambition is to give large dogs more healthy years by lowering a growth signal associated with their size. Loyal has reported an FDA preliminary-effectiveness milestone, but LOY-001 is still in development. There is no established figure for how many additional years a treated dog might live.

LOY-001 at a glance

What is LOY-001?
Loyal’s investigational long-acting injection for large dogs, focused on IGF-1.
Who is it intended for?
Loyal currently names dogs 7+ years and 40+ lb. These are development targets, not an approved label.
Is it available?
The sources reviewed on October 6, 2026 still describe development. No confirmed retail availability or final price was verified.

A drug programme and a nutritional formula

QuestionLOY-001Hollywood ElixirWhat it means
PurposeTest a targeted IGF-1 approach to healthy lifespan in large dogs.Supplementary healthy-aging nutrition through 17 active ingredients.A medicine and a nutritional formula have separate purposes.
Evidence being discussedReported RXE acceptance and ongoing drug development.Composition, normal biochemistry and scoped ingredient studies.Ingredient rationale is not a finished-product lifespan result.
RoutineProposed veterinarian-administered long-acting injection.Powder mixed into food at the applicable serving.The right routine depends on its purpose and actual directions.

Competitor label and pricing facts checked October 6, 2026. Sources are listed in the References section below.

Woman holding a Hollywood Elixir box beside a pug, a terrier and a food bowl

Why researchers focus on large dogs

A Great Dane and a small terrier belong to the same species, yet their typical lifespans can differ substantially. Body size is one clue to that difference. Selective breeding has produced enormous variation in size, making dogs useful for investigating how growth-related biology and aging fit together.

One landmark genetic study identified a variation near the IGF1 gene that was common in small breeds and nearly absent in giant breeds. That finding helped connect a familiar difference—the size of the dog beside you—to a specific biological pathway. It did not test a longevity medicine or show that changing an adult dog’s IGF-1 would add years. Sutter and colleagues, 2007

Our dog lifespan by breed guide gives the wider size-and-breed context.

Woman in sportswear holding a Hollywood Elixir box beside a black-and-tan dog outdoors

What IGF-1 does—and what Loyal hopes to change

IGF-1 stands for insulin-like growth factor 1. It is a signalling protein involved in growth. A growth signal helps the body build and maintain tissues; the research question is whether the level and persistence of that signal later in life also influence aging.

Loyal’s hypothesis is that reducing elevated IGF-1 in large adult dogs could reduce some of the biological consequences associated with their size. The company’s LOY-001 announcement describes this as the drug’s intended approach. It does not mean shrinking an adult dog or reversing its breeding history. Loyal’s explanation of LOY-001

Woman holding a Hollywood Elixir box above her forehead beside a Bernese mountain dog outdoors

The difference between an interesting link and a treatment result

A study of dogs across a wide range of sizes found that circulating IGF-1 generally increased with body weight. Age, sex and neutering status also affected the relationships. This adds evidence that IGF-1 belongs in the size-and-aging discussion; it is more complicated than assigning every large dog the same hormone level. Canine IGF-1 study

The essential next step is an intervention: give a defined treatment to appropriate dogs, compare outcomes, and find out whether they actually live longer and remain well. A correlation between a blood measurement and body size cannot supply that answer. Nor does it give an owner a target IGF-1 number to pursue through food restriction, human medicines or supplements.

Golden retriever nuzzling a woman holding a Hollywood Elixir box on the grass beside a food bowl

What Loyal’s early evidence actually combined

Loyal’s 2023 announcement describes two different kinds of evidence. In laboratory studies, dogs in a model of accelerated aging received LOY-001 and researchers measured aging-related changes. A separate observational study involved 451 dogs that did not receive the drug. Loyal says it linked the model-study findings with owner-assessed quality of life and veterinary health outcomes in that observational group. Original announcement

The distinction matters: the 451 dogs were not a treated group shown to live longer. This is the sponsor’s account of the submission, not a complete published trial dataset.

LOY-001’s FDA effectiveness milestone was progress toward approval. It did not authorize veterinarians to prescribe the injection.

What the 2023 FDA milestone meant

On November 28, 2023, Loyal announced acceptance of the reasonable expectation of effectiveness portion of its LOY-001 conditional-approval application. Often shortened to RXE, this is the preliminary-effectiveness requirement in that pathway. Loyal’s announcement

That was meaningful progress for a proposed lifespan-extension use. It was not the final conditional-approval decision or a demonstrated number of extra years for an individual dog. As of October 6, 2026, Loyal’s current product information still describes LOY-001 as in development. Current status

Overhead view of a black-and-white dog beside a food bowl and Hollywood Elixir box

What conditional approval would change

Conditional approval is an actual FDA authorization to market an animal drug for its labeled use while fuller effectiveness evidence is collected. Safety and other applicable requirements must also be met. Acceptance of the effectiveness section alone does not grant that authorization. FDA’s explanation

If approval is granted, the authorized label will govern use. FDA prohibits extra-label use of conditionally approved animal drugs, making the final directions especially important.

Woman smiling beside a golden retriever, a green food bowl and a Hollywood Elixir box

What stronger lifespan evidence needs to answer

Showing that a drug lowers IGF-1 answers a different question from showing that dogs live longer. Stronger evidence needs to connect the intervention with that outcome, while keeping health and quality of life in view.

In its original announcement, Loyal described a confirmatory pivotal lifespan-extension study as part of the path to full approval. That statement does not supply a current protocol or completed result. Loyal’s account

When a new report appears, look for which dogs were studied, the comparison group, the follow-up period and the outcomes actually measured. A change in a blood signal and a difference in survival should remain separate findings.

Man holding a Hollywood Elixir box while sitting on an outdoor sofa with a golden retriever

Which dogs is the injection intended for?

Loyal currently names dogs at least seven years old and weighing at least 40 lb. These are development targets, not a final prescribing label or confirmation that every dog meeting both numbers is suitable. Owner information

A dog’s health history, medicines and examination would still belong in a prescribing decision. The thresholds also do not make a younger, smaller or medically complex dog a candidate through an owner’s adjustment of the dose.

Would injections suit your dog?

Loyal proposes a long-acting injection administered by a veterinarian a few times a year. The final dose and interval would depend on the authorized prescribing information. Loyal’s proposed format

Some families may welcome a treatment they do not have to give every day. Others may prefer a powder mixed into food at home, especially if their dog finds injections or clinic visits difficult. The routine matters alongside the intended benefit. Hollywood Elixir offers that food-mixed format for healthy-aging nutrition; it is not a way to reproduce LOY-001’s proposed drug effect.

If LOY-001 becomes available, ask your veterinarian about the actual visit schedule and any monitoring before deciding whether it suits your dog.

IGF-1 connects body size with a growth pathway. LOY-001 is being developed to test whether lowering that signal can extend healthy life in large dogs.

Spotted gray dog beside a Hollywood Elixir box held in a person's hand

Can owners obtain it or join research?

We could not verify commercial availability, a final prescribing label or a confirmed retail price for LOY-001 in the reviewed sources. Earlier launch targets remain plans until an actual authorization and access announcement establish otherwise. Loyal’s current products

Research participation and commercial prescribing are separate routes. In particular, Loyal’s fully enrolled STAY study concerns LOY-002, not this injection. Use the named programme’s current information when looking for research opportunities. Clinical-trials information

If commercial access is announced, ask about the total cost of care, including administration and follow-up. A forecast drug price alone cannot establish that total.

Golden retriever nuzzling a man holding a Hollywood Elixir box beside a food bowl

LOY-001, LOY-002 and LOY-003 are different programmes

LOY-001 is the long-acting large-dog injection. LOY-003 is Loyal’s separate daily-pill programme for large dogs, currently described for dogs five and older weighing at least 60 lb. Its 2026 RXE announcement belongs to LOY-003. Current distinctions

LOY-002 is the senior-dog daily pill associated with insulin sensitivity and STAY, intended for dogs ten and older weighing at least 14 lb. Our LOY-002 guide explains it.

Check the product number before applying a headline about a pill, safety milestone or study to the injection.

Golden spaniel eating from a green bowl beside a Hollywood Elixir box

Age, medicines and health history: what your vet needs

Loyal’s age and weight thresholds describe the dogs it hopes to treat. Your veterinarian would also need to consider your dog’s current illnesses, medicines and examination findings. Bring the complete medicine and supplement list, and mention difficulty with injections or travel. These details would help assess an authorized treatment alongside its final prescribing instructions.

A senior-dog appointment can address existing changes now. Reduced appetite, weight loss or difficulty getting up deserve attention whether or not a longevity drug becomes available. AAHA’s senior-pet guidance

Care while following the research

A large dog that struggles to rise, loses weight or eats less needs an assessment of that change. These signs are not a home diagnosis of elevated IGF-1, and a future longevity medicine should not delay current care.

Keep notes on when the change began and what your dog can still do comfortably. Our senior-dog signs guide helps organize observations; AAHA’s guidance explains why the health history remains central.

A separate choice in daily healthy-aging nutrition

Hollywood Elixir is our healthy-aging powder for adult and senior dogs and cats. Its 17-active formula brings cellular-energy, antioxidant and immune-nutrition ingredients into the usual meal. It has a different purpose from LOY-001: supplementary nutrition, rather than a targeted drug intervention.

The full recipe includes NR tartrate, niacin, riboflavin, vitamins B6 and B12, CoQ10, reduced glutathione, astaxanthin, vitamins C and E, resveratrol, quercetin, yeast beta-glucan, reishi, spirulina, blueberry and whey protein isolate. The complete panel identifies their precise preparations and declared amounts.

The explanation below concerns normal biology and ingredient research. It does not establish changes in a dog’s energy or antioxidant measurements, or longer lifespan, from the finished formula.

Woman holding a Hollywood Elixir box beside a dapple dachshund and green food bowl on a sofa

Why energy and antioxidant ingredients belong together

Food contains energy, but cells need reactions that make it usable. NAD carries electrons as nutrients are broken down. In mitochondria, electron transfer helps produce ATP, which powers cellular work; CoQ10 carries electrons within that machinery. Hollywood Elixir combines NR tartrate and niacin, ingredients connected with NAD production, with CoQ10 and companion B vitamins. They contribute different nutritional roles to the same energy story. NAD and CoQ in respiration

The same cells also manage reactive molecules. Reduced glutathione helps an enzyme convert hydrogen peroxide into water. Another enzyme recycles used glutathione with a coenzyme made from riboflavin. Hollywood Elixir includes both reduced glutathione and riboflavin alongside its wider antioxidant ingredients. Energy conversion and antioxidant management are connected parts of normal cellular work, which is why we consider them together. Glutathione’s reaction · Recycling · Riboflavin

Our NAD+ guide and NR guide follow the energy explanation in more detail.

See how cells make, use and recycle NAD+ in our NADome and NADomics guide.

Woman cuddling a brown-and-white spaniel while holding a Hollywood Elixir box

Immune nutrition completes the wider formula

Hollywood Elixir’s spirulina and yeast beta-1,3/1,6-glucan bring a different research question: how dietary ingredients affect immune responses. A spirulina diet study reported higher vaccine-antibody responses and fecal IgA, an immune marker. In 24 Labradors, yeast beta-glucan diets changed some immune-cell responses without higher antibody titers between diets. Spirulina study · Beta-glucan study

These studies used different diets and preparations from Hollywood Elixir. They inform ingredient selection for normal immune support; they do not demonstrate infection prevention or lifespan extension from this powder. Alongside the energy and antioxidant ingredients, they give the full formula a broader nutritional purpose.

17 longevity actives, mixed into their usual food

Hollywood Elixir brings NAD+ precursors, mitochondrial cofactors, antioxidants and immune-nutrition ingredients together in one daily powder. It is a complete 17-active nutritional system for adult and senior dogs and cats, designed to fit the meal you already serve.

That breadth is the reason to choose it. You can add ingredients for cellular energy, antioxidant defenses and normal immune function without assembling a cupboard of separate supplements. Follow the current serving directions for your dog’s size, and review the full formula with your veterinarian if medicines or a controlled diet are involved.

Explore the complete Hollywood Elixir formula, then choose the serving and pack for your dog.

Hollywood Elixir brings connected nutritional roles into one meal: cellular energy, antioxidant systems and normal immune support.

Educational content only. This material is not a substitute for veterinary advice. Always consult your veterinarian about your dog’s specific needs. These statements have not been evaluated by the Food and Drug Administration. Products mentioned are not intended to diagnose, treat, cure, or prevent any disease.

Glossary

  • IGF-1: Insulin-like growth factor 1, a signal involved in growth.
  • RXE: Reasonable expectation of effectiveness: the preliminary-effectiveness requirement used in conditional approval.
  • Conditional approval: FDA authorization for labeled sale while fuller effectiveness evidence is collected.
  • NAD+: A coenzyme involved in cellular reactions, including energy metabolism.
  • ATP: A molecule supplying energy for much of a cell’s work.

Related Reading

Aging & Senior Dog Guidance
• Dog Age Calculator
• Dog Lifespan by Breed
• Dog Dementia
• Lethargy in Dogs
• My Dog Won't Eat
• Dog Pacing At Night
• Dog Licking Paws
• Can Dogs Dehydrate

Healthy Aging Support
• NAD+ for Dogs
• NMN for Dogs
• Antioxidants Supplements for Dogs
• Best Senior Dog Supplements & Vitamins
• Rapamycin for Dogs

References

Sources and further detail

  1. Loyal: products in development

    Current product formats and stated development populations.

  2. Loyal: information for dog owners

    Current eligibility targets and the company’s regulatory-status statements.

  3. FDA: conditional approval explained

    Explains the authorization pathway; a technical-section acceptance is a separate step.

  4. Loyal: LOY-001 effectiveness milestone

    The original November 2023 sponsor announcement and its account of the evidence.

  5. Loyal: LOY-002 safety milestone

    January 2026 sponsor report; public study summaries do not replace final prescribing information.

  6. Loyal: STAY clinical trial

    Study design and current enrollment status, not a published final outcome.

  7. Sutter and colleagues: IGF1 and breed size

    Genetic research on body size in dogs; no longevity-drug intervention.

  8. Greer and colleagues: circulating IGF-1 in dogs

    Observational measurements of IGF-1, body size and age.

  9. NR metabolism in mammalian cells

    Mechanism research on an NAD precursor; not a Hollywood Elixir trial.

  10. Reactome: NADH and CoQ in respiration

    Normal cellular biochemistry, used to explain ingredient roles.

  11. Reactome: glutathione and hydrogen peroxide

    The enzymatic reaction involving reduced glutathione.

  12. Reactome: glutathione recycling

    The recycling reaction; normal physiology is distinct from an oral-product result.

  13. NIH: riboflavin

    The vitamin’s coenzyme roles; human intake guidance is not a dog serving recommendation.

  14. Spirulina diet study in dogs

    Canine immune-marker findings from a different diet and preparation.

  15. Yeast beta-glucan diet study in Labradors

    Immune-cell findings without higher antibody titers between diets; not a trial of the finished LPL formula.

  16. AAHA: evaluating the healthy senior pet

    Professional guidance on history, medicines, supplements and changes owners observe.

  17. Hollywood Elixir: complete ingredient panel

    Current manufacturer composition information, separate from evidence of clinical outcomes.

FAQ

Is LOY-001 FDA-approved?

As of October 6, 2026, Loyal still describes LOY-001 as a drug in development. Its November 2023 reasonable-expectation-of-effectiveness milestone was one technical part of the conditional-approval process, not authorization to sell or prescribe the product.

Which dogs is LOY-001 intended for?

Loyal currently names dogs at least seven years old and weighing at least 40 lb. Those are development targets, not a final prescribing label or confirmation that an individual dog is suitable.

Is LOY-001 an injection or a pill?

LOY-001 is the long-acting veterinarian-administered injection. LOY-003 is Loyal’s separate large-dog daily-pill programme. LOY-002 is the senior-dog pill studied in STAY.

What does LOY-001 do to IGF-1?

Loyal is developing LOY-001 to lower IGF-1, a signal involved in growth. The aim is to test whether altering that biology can extend healthy lifespan in large dogs. An IGF-1 association is not itself proof of a lifespan benefit from treatment.

Can I buy LOY-001, and is its price known?

We could not verify commercial availability or a confirmed retail price in the current sources. Follow Loyal’s dated announcements and ask your veterinarian about an authorized product if access is announced.

How is Hollywood Elixir different from LOY-001?

Hollywood Elixir is a 17-active healthy-aging nutrition powder mixed into food. Its design connects NAD-related nutrition, cellular energy, antioxidant systems and normal immune function. It is not an IGF-1 medicine, has not been shown here to extend lifespan, and should not be assumed safe to combine with an investigational drug.

Dalmatian looking toward a Hollywood Elixir box held in a person's hand

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