Immune

Peptides that modulate immune and inflammatory signalling. Some are approved in specific countries or indications; general 'immune-boosting' claims are weaker.

Community-reported ranges are anecdotal and not clinically validated. Evidence grade shown reflects the strength of available human data. Not a prescription. Legal status varies by country and changes over time; verify locally.

5 peptides

Thymosin Alpha-1

Human RCT

Tα1, Zadaxin

An immunomodulatory peptide approved in several countries (e.g. as Zadaxin) for hepatitis and as a vaccine adjuvant. Approval status varies by region.

KPV

Animal / preclinical

Lysine-Proline-Valine

A tripeptide fragment of alpha-MSH studied for anti-inflammatory effects, largely in cell and animal models.

LL-37

Animal / preclinical

Cathelicidin fragment

A human antimicrobial peptide studied for immune and wound-healing roles. It is a double-edged molecule in research and unproven as an injectable product.

VIP (Vasoactive Intestinal Peptide)

Human observational

Aviptadil, Vasoactive Intestinal Polypeptide

A signalling peptide with broad anti-inflammatory and vasodilatory roles. Its synthetic form (aviptadil) has been investigated for lung conditions; intranasal VIP appears in off-label chronic-inflammatory (CIRS) protocols with limited formal evidence.

Thymalin

Human observational

Thymus peptide extract

A thymus-derived peptide preparation used clinically in Russia and some neighbouring countries as an immunomodulator. Independent evidence outside that setting is limited.