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Thymosin Alpha-1 vs VIP

Updated 13 sources

Key differences

  1. 1VIP is a vasodilating neuropeptide used in CIRS. Thymosin alpha-1 is an immune modulator approved for some uses outside the US.

Side by side

Facts from each record, in the same words as their own pages.
Thymosin Alpha-1 and VIP side by side
Thymosin Alpha-1VIP
Category
  • Immune, Longevity
  • Immune, Other
Evidence
  • Some human trials
  • Limited human data
FDA status
  • Not FDA approvedRegulatory
  • FDA 503A Category 1Regulatory
WADA
  • Not confirmed
  • Not confirmed
Half-life
  • About 2 hours after an injection under the skin, with peak levels at about 2 hours and no build-up between doses (label).Regulatory
  • About 2 to 3 hours per guides; peak 1 to 2 hours after injection.Competitor guide
  • About 1 minute in the blood after IV infusion in healthy volunteers. Enzymes such as NEP and DPP-IV break it down fast.Clinical study
Routes
  • Subcutaneous injection
  • Nasal, Subcutaneous injection, Other route
Forms
  • Vial (powder)
  • Nasal spray, Vial (powder), Other form
Reported doses
  • 0.8 to 3.2 mg (subcutaneous injection)
  • 40 mcg/kg (subcutaneous injection)
  • 250 to 500 mcg (subcutaneous injection)
  • 50 to 200 mcg (nasal)
  • 50 to 500 mcg (subcutaneous injection)
  • 25 to 100 mcg (other route)
Most cited frequency
  • Twice a week
  • Once or twice daily
Vial sizes
  • 1.6 mg, 5 mg, 10 mg, 20 mgRegulatory
  • 10 mg, 5 mgCompetitor guide
Mixed vial keeps
  • Zadaxin mixed with its sterile water is single use: inject immediately.Regulatory
  • Fridge at 2 to 8 C, not frozen.Competitor guide
Protocols on file
  • 19
  • 15

Doses shown are what sources report, labelled by origin. Not medical advice.

Read each in full

Sources

13 sources, each checked by date. Record updated Oct 24, 2026. Numbers are restated in our own words and labelled by where they came from.

Competitor guide6

  1. VIP peptide dosing guidepeptidedosingprotocols.com · checked Oct 24, 2026
  2. Thymosin Alpha-1 (TA1) guidepeptidedosingprotocols.com · checked Oct 24, 2026
  3. Thymosin Alpha-1 (10 mg vial) dosage protocolpeptidedosages.com · checked Oct 24, 2026
  4. Thymosin Alpha-1 profilepeptidesexplorer.com · checked Oct 24, 2026