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The Immune System Has An Upstream

TPA Works There

A patented, peer-reviewed protein for practitioners who want to address immune health at the source β€” not just the symptom.

FOR HEALTHCARE PROFESSIONALS

Not a Booster. A Regulator.

Most immune supplements work by stimulating the immune system broadly β€” pushing harder, amplifying activity, adding fuel. That approach has its place. But it doesn't address what actually declines as we age: the thymus gland's ability to produce and mature functional T-cells.

Thymic Protein A (TPA) works upstream. It is the signaling protein your thymus produces naturally β€” the one that binds to immature CD4+ T-cells and initiates their maturation into functional immune responders. When that signal declines (as it does for virtually everyone over 40), the entire downstream immune cascade loses precision.

TPA doesn't stimulate. It restores the signal β€” helping the immune system respond appropriately: stronger when threatened, calmer when overactive.

That's immune modulation. And it's the only supplement of its kind.

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35+ Years of Clinical Use
PNAS Peer-Reviewed Publication
NIH Recognized Immune Regulatory Protein
4 US Patents - Composition, Production & Use
Zero Significant Adverse Events Reported
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The Science

35 Years. One Protein. One Scientist.

Thymic Protein A was discovered by Dr. Terry Beardsley, PhD β€” an immunologist whose foundational research was published in the Proceedings of the National Academy of Sciences in 1983, communicated by Nobel laureate Nathan O. Kaplan.

TPA is a complete, intact glycoprotein of approximately 500 amino acids (50 kDa). It is produced by stromal epithelial cells of the thymus gland, and its function is highly specific: binding CD4 receptors on immature progenitor T-cells to initiate their maturation into functional CD4+ helper T-cells.

This maturation cascade is upstream of nearly every measurable immune response. CD4+ cells regulate cytokine secretion (IL-2, IFN-Ξ³), activate CD8+ cytotoxic cells, and differentiate into memory, regulatory, and helper subsets. The amplification effect is substantial β€” which is why TPA is active at microgram doses.

TPA is distinct from thymic extracts, thymosin fractions, and peptide supplements. It is a single, purified, intact protein with a verified mechanism of action. Its amino acid sequence shares no homology with any known cytokine, including IL-1, IL-2, IL-3, IL-4, IL-6, IL-7, or G-CSF.

Dr. Beardsley is the only person in the world who manufactures TPA. It is produced at his Murrieta, California laboratory under his direct supervision. There is one source. There is no generic.

View The Research

Clinical Evidence

Human Studies. Peer-Reviewed. Cited.

TPA's clinical record spans human trials, a USDA-licensed injectable form used in veterinary medicine, and 35+ years of practitioner use. Below are the key published studies most relevant to clinical practice.

Human Clinical Trial

Immune Normalization in Chronic Fatigue Patients

Context: 23-patient, 90-day study. Published in the Journal of Nutritional & Environmental Medicine, 2001.

Findings:

  • 70% of patients experienced normalization of key immune markers
  • Statistically significant improvements in white blood cell counts and CD8+ activation
  • Symptom improvements in energy, sleep quality, mood, and resilience
PILOT STUDY

TPA and Epstein-Barr Virus: A Pilot Study

Context: 6-patient pilot study of TPA supplementation in EBV-positive individuals. Results showed an average 46% reduction in viral titers.

Findings:

  • 4 of 6 patients showed significant reduction in EBV titers
  • Average viral load reduction of approximately 46%
  • Notable clinical improvements in fatigue, resilience, and overall wellness
REGULATORY RECOGNITION

Recognized by NIH. USDA-Licensed Protein.

Context: TPA is the only supplement of its kind to receive recognition from both the NIH and USDA.

Findings:

  • NIH determined TPA to be an effective immune system regulatory protein
  • The injectable form of the same protein held USDA conditional licensure as an immune modulator
  • The only USDA-approved product of its kind β€” reflecting a decade of controlled research on the underlying protein

WHAT PRACTITIONERS ARE SAYING

Trusted by Physicians for Over Three Decades

The best single immune system supplement available. My favorite way to stimulate thymic immune function.

– Dr. Jacob Teitelbaum, MD - Diplomate, American Board of Internal Medicine

Thymic Protein A is likely the most powerful natural immune regulator ever discovered. I've seen it support immune balance in a wide variety of patients.

– Dr. Julian Whitaker, MD

No other product has demonstrated the power to support the immune system in people of all ages like Thymic Protein A. An essential supplement for anyone seeking health and longevity.

– Sharon Perlow, ND

We here at Los Gatos Longevity Institute have been staunch proponents of the preventative properties of Thymic Protein A. I think it is superior to any prescription-strength agents available.

– Dr. Phillip Lee Miller, MD - Los Gatos Longevity Institute

First aid for an aging immune system.

– Dr. Robert Roundtree, MD
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CLINICAL APPLICATIONS

Where Practitioners Are Using TPA

TPA is an immune modulator β€” which means it is appropriate for both underactive and overactive immune presentations. No known drug interactions. Safe to use alongside any existing protocol.

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Chronic Immune Imbalance

For patients whose immune systems have been operating below baseline for an extended period β€” persistent low energy, slow to bounce back from illness, and immune function that hasn't bounced back. TPA works upstream to restore the T-cell signaling that drives the entire immune response.

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Healthy Aging & Thymic Decline

After age 40, most patients have significantly reduced thymic output. By 65, the thymus is largely non-functional. TPA restores the maturation signal β€” supporting T-cell competence in patients where conventional immune support falls short.

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Post-Infection Immune Support

In the weeks following a viral or bacterial infection, immune signaling can remain elevated or erratic even as symptoms resolve. TPA supports a return to immune balance during this transition period β€” helping the system recalibrate rather than remain on high alert.

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Down-Regulation Support

For patients whose immune systems are overactive rather than underactive β€” where the response has become disproportionate or misdirected. TPA supports regulatory T-cell differentiation, helping down-regulate immune activity and restore appropriate signaling without suppressing the system entirely.

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Immune Resilience Under Stress

Chronic physical or emotional stress suppresses thymic output and T-cell maturation. TPA supports balance during high-demand periods without overstimulating a system already under load.

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THE PRODUCT LINE

One Protein. Three Formats. Built for Clinical Flexibility.

All Humanset products deliver the same purified, intact Thymic Protein A. Format choice depends on patient preference and delivery method.

TPA Powder Packets β€” 4 mcg | Sublingual
Best for fastest absorption and acute support protocols. Pour under tongue, hold 60 seconds.

TPA Capsules β€” 4 mcg | Delayed-Release
Best for daily convenience. Capsule bypasses stomach and absorbs in the intestine.

TPA Tablets β€” 1 mcg | Sublingual
Best for daily maintenance and flexible lower-dose protocols. Dissolves under tongue.

Dosing Guidance:

Maintenance: 1 serving/day (4mcg product) or 1–4 tablets/day (1mcg)
Active support: 2–3 servings/day, as often as every 3–4 hours
Food timing: At least 30 min before or 60 min after food
Consistency: Minimum 30 days recommended for chronic presentations
No known drug interactions. No known contraindications. Safe for long-term use.
Non-GMO. Gluten-free. Dairy-free. Made in the USA.

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Additional Reading

Clinical Reference Packet

The complete TPA practitioner resource: science, studies, product specs, and dosing guidance in one document.

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