Our Guarantee


Thymosin Labs™ only sells legitimate, 99%+ purity, premium quality TB 500 recovery peptides. All of our products are guaranteed to be of the highest potency and effectiveness.

30-Day Money Back Guarantee. We proudly stand behind our products with our 30-day money back guarantee. If you are unsatisfied with your purchase, return all unopened vials within 30 days and we will refund your money. Custom bulk orders are not refundable.


99%+ Pure, USA Made. Our peptides are greater than 99% pure, and we’ll happily provide HPLC and Mass Spectrometry analyses along with your order to verify our product’s quality. We synthesize our products monthly, and it will remain 100% potent for over 18 months when kept frozen. Our products will also maintain 100% potency when stored at room temperature for up to 60 days.


Same Day Shipping. All orders placed before 11:00 AM EST Monday-Friday will be mailed that business day. Subsequent orders will be mailed the next business day. Purchases will be updated with a tracking number 24 hours after the mail date.


Purchase Risk Free. Be confident that you're buying genuine, top quality recovery peptides. We know that your time is too valuable to be wasted by buying low quality products.


Our Dedication to Quality: American Made TB500

At Thymosin Labs™, we utilize automated peptide synthesizers as well as solution and solid-phase peptide synthetic technology to offer premium quality, American made TB 500 that exceeds 99% purity, guaranteed. Headquartered in Milwaukee, Wisconsin, our labs ensure that no details are overlooked, synthesizing recovery products that are of superior purity and quality. Unfortunately, inferior quality Thymosin peptides are often adulterated with additives or cheap fillers that can drastically reduce the product’s effectiveness. Make sure that you don’t waste your money or time with a cut-rate product. Buy only premium quality, additive-free recovery peptides manufactured in the United States from Thymosin Labs™. Read more about our company.


Highly Purified Thymosin Beta-4

Thymosin Labs™ offers the highest quality recovery peptides that are proudly manufactured in the United States. Synthesized in cGMP certified facilities, our products are purified multiple times, verified three times via HPLC testing and exceed the highest global quality standards. Further, our staff always ensures that your order arrives swiftly at the peak of purity and potency. Unquestionably, our professional clients demand an exacting standard of quality when buying online. If requested, any order will be mailed with a detailed HPLC (High Performance Liquid Chromatography) Purity Analysis Report. We synthesize our products fresh on a monthly basis to guarantee the utmost possible potency and stability.


Our Promise To Our Customers

As a leader in recovery supplementation, our company always puts the customer first. This promise covers not only the superior level quality of our products, but also how we deal with you, the customer, in every aspect of the order process. That's why we strive to maintain a standard of excellence in customer service that few companies in any field can match. From responding promptly to order inquiries to shipping every order within one business day (and often same day for orders placed before noon central time), our company is absolutely dedicated to fulfilling all of our customers' needs. Have a question or comment? Feel free to contact us today.