ProBoost Thymic Protein A: 10-ct TrialProduct Description ProBoost Thymic Protein A: 10 ct Trial Pouch. Back in stock, while supplies last! Our original, best selling product, in a 10 packet, trial size pouch. Each packet has 4 micrograms (12 Trillion active molecules) of Thymic Protein A per serving. And with 10 packets, you'll have just enough to see if it provide that immune support you're looking for. For nearly 30 years, people have been using ProBoost as their go to supplement to

now with 60 single-serving powder packets of ProBoost

TPA Powder Packets — the original format

At 1 mcg per tablet

Instead of stimulating your immune system indiscriminately

Not feeling your best a need a little (or a lot of) extra help

Just swallow and move on

Same 4 mcg dose as the powder

Are you trying Thymic Protein A for the first time and want to determine which version suits you best

Anyone who wishes to maximize quality of life and longevity should consider taking a regular protective dose of ProBoost

It's keeping it going

ProBoost brand products are still the only products to feature our patented active ingredient

All three TPA formats