Thymic Protein A - 4 mcg, 30 packets by ProBoost

Immune Modulator & Anti-viral Agent

  • Unique sublingual powder for optimal benefit
  • Promotes production of T-lymphocyte cells
  • Effective Thymus gland and immune support


The thymus gland, the master organ of the immune system, produces T cells, key defenders of your health. As we age the thymus gland shrinks, leaving only the remnants of thymic protein stimulation. The single protein contained in Pro Boost Thymic supports thymus activity by increasing the production of T4 lymphocytes.

Until recently, the idea of oral administration of proteins has been excluded, because large polypeptides would be digested and unabsorbed. Because the product [ProBoost Protein Thymic A] is taken sublingually, the degradation of the protein in the stomach is avoided. Furthermore, large proteins can be absorbed intact across oral mucous membranes.

How it Works
The primary ingredient in ProBoost is Thymic Protein A. Thymic protein is the key to the human immune system, and has been scientifically demonstrated to stimulate immune activity. ProBoost stimulates T-4 helper white cells to locate abnormalities and to dispatch T-8 killer cells to destroy them. ProBoost contains over 500 amino acids, comprising the entire protein molecule. All other existing thymus products are not biologically active, because they contain only fragments of the entire thymic protein necessary to stimulate T-4 cells.

Fragmented proteins will not "fit" into the receptor site of the T-4 cell, and therefore will not program it as ProBoost does. No other thymus extract or product is comparable to this unique protein. It is so unique that the doctor who developed this product has been awarded a US patent.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Label Information

Supplement Facts
Serving Size: 1 packet
Servings Per Container: 30
Amount Per Serving%DV*
Thymic Protein A4 mcg*
*Daily Value not established.

Note: No animal was sacrificed for this product.

  • Suggested Use:

    As a dietary supplement, empty one packet directly under tongue and allow to dissolve for 3 minutes. Use 1-3 packets daily, as often as every 4 hours, or as directed by a health care practitioner. Take 30 minutes before a meal or 1 hour after. Important: Allow contents to dissolve under tongue before swallowing, or protein will be inactivated by stomach contents.

  • Shelflife: 2 years
  • Processing: Purified to homogenicity and freeze dried.
  • Other Ingredients: Maltodextrin (polymers of D-glucose)
  • Contains No: Salicylates, dairy, wheat, gluten or soy.
  • Salicylates:
  • Initial Source: Each packet contains 4 micrograms freeze-dried, purified Protein A from calf thymus cell culture, in a base of maltodextrin.

Frequently Asked Questions

1. How does ProBoost® Thymic Protein A (TPA) work?
Immunologist Dr. Terry Beardsley, PhD, is one of the world's leading authorities on the thymus gland and its crucial importance for the proper functioning of the immune system. He spent the past 25 years studying the thymus gland and discovered the existence of TPA. He currently holds a US and international patents – both composition of matter and use. His discovery was published in several scientific journals, including the Journal of the National Academy of Sciences (Vol. 80, pp 6005-6009, October 1983, Immunology). TPA is an essential substance, necessary for the proper functioning of the immune system; specifically the portion named "cell-mediated immunity” which controls how harmful agents are controlled and disposed of by the immune system. Each of the 12 trillion molecules of TPA in a single packet of ProBoost® contains an important "transmitter" which seeks out the T-4 helper white blood cell and attaches to it to activate the cell. The T-4 helper cell is the "brain" of the immune system and controls critical fighting cells such as the T-8 killer cells and T-8 suppressor cells, by secreting chemical messengers called cytokines, such as interleukin-2 and interferon. When the body has a sufficient amount of properly working T-4 cells, proper amounts of cytokines are made to allow the entire system to function properly.

2. What is ProBoost® and how does it work?
The active ingredient in ProBoost® is thymic protein A, the critical protein which programs the body’s T-cells to stimulate an immune system response. A daily dose of ProBoost® will supplement this critical thymic protein A. ProBoost® can make a major difference in the longevity by strengthening the immune system through its T-cell “programming” role. The more T-cells that are properly functioning, the more immune response may be mounted.

3. Who should take ProBoost® Thymic Protein A and what is the recommended dose?
Anyone who is concerned about immune system function can take ProBoost®. Healthy individuals, who wishe to maximize quality of life and longevity should consider taking a regular protective dose of ProBoost® TPA, which is one packet every three days.

4. What will I feel when I Take TPA?
The immediate effects of taking a packet of TPA vary from a sensation of warmth and energy to no particular short-term change in feeling. The longer-term effects (days or weeks) are often an increase in energy, well-being, strength, improved sleep patterns, and improved immunity. All of these benefits can result from an improvement in immune function.

5. What's in the packet or capsule of ProBoost®?
• Packet Formulation
Each packet of ProBoost® contains 500 milligrams of powder. The contents contain maltodextrin, a pleasant, mildly sweet powder made from cor-syrup solids and 4 micrograms (12 trillion molecules) of potent active Thymic Protein A.

• Capsule Formulation
Each veggie cap (vegetable capsule) contains 4 micrograms of potent active Thymic Protein A and Xylitol, a slightly sweet excipient.

6. Is ProBoost® safe? How is it made?
ProBoost® is extremely safe. It is made by cell culture in only one laboratory in the world, under the direct supervision of Dr. Beardsley. It is made from stored frozen cells taken from the thymus of one US calf, which was selected and sacrificed 11 years ago. No animals are sacrificed to make TPA. Because TPA is highly purified, all other proteins, fragments, or substances are filtered out, leaving only the single Thymic Protein A, which is then freeze-dried and mixed with maltodextrin. NOTE: ProBoost® does not contain wheat or dairy products.

7. What are the results of scientific studies?
Scientific studies, performed on in vitro cells, animals, and humans, have all shown significant benefits in supporting and strengthening the immune system by activating the T-4 helper cells. Reported results include increased immunity, improving sleep and energy, and promoting quality of life for ill individuals. A strong immune system is necessary to be healthy.

8. What are the benefits of taking ProBoost®?
The benefits of strengthening the immune system with ProBoost® include increased stamina, energy, feeling of well-being, and wellness.

9. How did ProBoost® come into being?
Over the past six years since Thymic Protein A was introduced as an oral nutritional supplement, several human studies have further substantiated the scientific findings that this protein ALONE, in its purified state, has tremendous immune supporting capabilities as both a stimulant and a down-regulating agent, depending on the body's requirements. Thousands of individuals have consumed this product, and hundreds of medical doctors are using it with no adverse reactions from this highly purified, extremely safe, low-dose protein molecule. Thymic Protein A is produced at only one site in the entire world, under the personal control and supervision of Dr. Beardsley, who is committed to maintaining the high scientific standards which he established in the research and manufacture of this product over the past 30 years. Future studies, already in progress, will expand the range of application of this product.

10. How do you take ProBoost®?
ProBoost® is sold as a powder in sealed individual dose packets, administered under the tongue, where it rapidly dissolves. Boxes are sold containing 30 packets. The suggested use is from 1-3 packets per day. Those who wish to maintain their immune function on a regular basis may use one packet daily, or every other day. Higher doses are not harmful and may actually produce additional benefits. ProBoost® recommended dosage for children is 1 packet 3 times per day.

11. Is ProBoost® a drug?
ProBoost® is not a drug. The product is a naturally occurring substance within the human body. ProBoost® contains the same protein produced by your body’s thymus gland which naturally supports the immune system.

12. Have any negative side effects been reported?
No serious side effects have been reported. In a few cases, people have experience very mild like flu symptoms when first starting ProBoost®. Shortly thereafter the symptoms subside. These initial symptoms occur because by taking ProBoost® you are activating the immune system. This seemingly negative effect is actually the beneficial effects of your own immune system.

13. What is the optimal dosage of ProBoost®?
• Use one to three packets per day or as directed by a health practitioner. Empty packet under your tongue and allow it to dissolve for 1-3 minutes.
• A maintenance dose of one packet per day is recommended.
• ProBoost® should be taken 1 hour before or 1 hour after meals of optimal absorption.
• ProBoost® recommended dosage for children is 1 packet 3 times per day. (Source:


Customer Reviews

Based on 21 reviews
Pro Boost "Best"

I take Pro Boost for an extra "boost" for my immune system. In my opinion, I believe it has helped with my allergies as well.

Anne D.
The best

For immune support.

Matteo T.
Good products

Good products

Marilyn H.
Thymus Protein A

Great product used to twiik Thymus gland several times a year!

Marilyn H.
Thymus Protein A

Great product used to twiik Thymus gland several times a year!

Kristin A.
Protein tunic a

Protein tunic a

Kristin A.
Protein tunic a

Protein tunic a

Kinga S.
Everything is great.

Everything with the order went well. Recommend.

Lisa M.
Pro Boost

I've been taking this supplement for several months now and feel it has given me more energy and I've had fewer flair ups of symptoms.

Marilyn H.
Good Periodic Product

Feel better within the week.