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Consultation desk

Questioning claims about a protein fragment

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Questions to take

Ask · A question sheet

# Keep the useful questions close.

Keep this question sheet nearby for the conversation. Pause after each answer and ask for a plain explanation of any word that gets in the way.

A path for your questions

Exact substance

Relevant evidence

Clear follow-up

Use the questions as prompts. There is no need to get through them all at once.

## Begin with the exact offer

### What substance are we talking about?

As of September 2026, TB-500 lacks approval from FDA, the Food and Drug Administration.

#### Is the substance TB-500 or full thymosin beta-4?

FDA treats these as different substances.

#### What version of TB-500 is being offered?

FDA found different substances sold under the TB-500 name. Ask how they will check that the product matches what the doctor means.

#### What law allows you to offer this exact substance?

Ask to see the rule, then compare it with the dated information on the US rules page.

Chapter notes

FDA’s findings on identity and naming

FDA’s approval records

## Ask for evidence that fits

### Which study supports this for my concern?

FDA found no published study giving TB-500 to people in the review checked in September 2026.

#### Did the study use the exact substance being offered?

Ask to see the paper rather than a short sales summary.

#### Was the result from people, animals or cells?

Ask what the evidence can and cannot establish for your concern.

#### What other care options could address the problem?

Ask for the reasons to consider each option, including doing no treatment for now.

Chapter notes

FDA’s search for relevant human studies

## Ask about the product claims

### What did the testing cover?

In the FDA review checked in September 2026, the TB-500 test sheets examined left important questions about an injection unanswered.

FDA’s concerns include germs, harmful material from bacteria (a kind of germ), and bits that do not belong in the injection.

Purity describes how free the tested substance is from other material. A high purity result does not show that all of these problems are absent.

#### Who prepared the product?

Ask who made it: get the pharmacy’s or doctor’s name along with the care website’s name.

#### What was tested on this batch?

A batch contains items made together at one time. Ask which tests are missing, and avoid treating a test sheet as proof of a benefit.

#### Who will answer questions after the visit?

Ask about follow-up and how to get written notes.

Chapter notes

FDA’s review of the quality checks

FDA on identifying the actual compounder

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