What is Thymulin?

The short answer

Thymulin is a peptide, a short chain of amino acids.

What it is
Thymulin: Thymic peptide (zinc-dependent).
Thymus hormone involved in T-cell maturation.
What people look into
Aging

2 sources
Status as of October 4, 2026
How we source
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By Ellum EditorialUpdated October 7, 2026AI use

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Peptides: Thymulin (1 selected) · edit

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What it is

Also known as: thymulin acetate
How it works: Thymus hormone involved in T-cell maturation.

Regulatory status

Not FDA-approved How we label status

As of October 4, 2026, Thymulin is not FDA-approved for any use and is not on FDA's 503A bulks list.

See Thymulin in the Index →

Federal (FDA): Not FDA-approved
503A compounding: Category 3 (since 2023-09-29); not on 216.23 as of 2026-10-07 (as of October 7, 2026)

Timeline

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Date	What happened	Source
May 14, 2026	FDA list of bulk drug substances nominated under section 503A, updated May 14, 2026, places thymulin acetate in category 3, nominated without adequate support.	FDA, event of May 14, 2026, on fda.gov

References

Sources as of October 4, 2026