ModerateCaution
Ashwagandha
Ashwagandha has immune and thyroid effects and could complicate autoimmune or immune-modulating protocols.
Recommendation: Avoid combining in autoimmune disease or immunosuppression unless a clinician approves.
Thymosin Alpha-1
Peptide ·Moderate evidence ·Reviewed May 2026
Thymosin Alpha-1 is a 28-amino-acid thymic peptide that modulates innate and adaptive immune responses. It is approved in some countries for hepatitis B or immune-adjuvant uses, but it is not FDA-approved in the United States. Evidence is strongest in selected infectious, sepsis, and hepatitis research settings, not general immune boosting.
What it's good for
What to watch for
- Injection-site reaction
- Fatigue
- Headache
- Pregnancy and breastfeeding unless specialist-directed
- Autoimmune disease flare without specialist review
The bottom line
Evidence rating moderate. Most-documented uses: approved outside the us for selected immune indications, studied as an adjunct in hepatitis and sepsis, can modulate t-cell and dendritic-cell function. 3 sources indexed (2015–2020), with 3 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Thymosin alpha-1 influences dendritic-cell maturation, T-cell differentiation, NK-cell activity, antigen presentation, and cytokine balance through pathways that include TLR and interferon-related signaling. It tends to normalize dysregulated immunity rather than simply stimulate it, but clinical effects vary by disease state. Use with autoimmune disease, transplant immunosuppression, chemotherapy, or biologics requires specialist review.1,2
Class
Thymic immunomodulatory peptide
Found in food
None as a dietary supplement
Low-status signs
No recognized dietary deficiency state exists for this peptide
Dosing
Dosing & protocol.
Common range
No FDA-approved US dose; approved-country protocols commonly use clinician-directed subcutaneous dosing such as 1.6 mg twice weekly for selected indications
Recommended form
Regulated prescription product where approved; avoid research-grade peptides
Peptides are generally not reliably orally bioavailable unless a specific studied oral formulation is used. Human use of research-grade products is not appropriate.
Forms
Forms & what to buy.
Ranked by evidence and value.
Regulated Thymalfasin Injection Recommended
Subcutaneous route with known pharmaceutical quality where approved. Use only under clinician supervision.
Compounded Thymosin Alpha-1
Not an FDA-approved finished product in the US. Quality depends on pharmacy controls.
Research Peptide Vial
Not appropriate for human injection. Sterility and identity cannot be trusted.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Regulated Thymalfasin Injection.
BudgetBest value
$60 /mo
$2.00 per dose
Mid
$180 /mo
$6.00 per dose
Premium
$450 /mo
$15.00 per dose
Research-market pricing is not a dosing recommendation; human use is not FDA-approved unless specifically stated. Updated 2026-06-04.
Goals
Goal-based dosing.
Lab work
Markers to track.
What to test, the optimal window inside the conventional range, and how long a response takes.
Absolute Lymphocyte Count ALC
May be followed in immune-compromised contexts but is not a specific response marker.2,3
Optimal
1200–3500 cells/uL
Conventional
1000–4800 cells/uL
Responds in
Baseline and follow-up per clinician
1000optimal4800
Interpret with CBC differential and clinical context.
CBC with differentialCD4 count
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Immune suppression
20% relevance
Studied as adjunct in some immune-compromised and infection contexts.3,2
ImmuneEmerging evidenceSpecialist-directed only
Coordinate with oncology, infectious disease, or transplant teams.
Frequent infections
18% relevance
Immunomodulatory research may be relevant in selected diagnosed immune dysfunction, not routine colds.1,2
ImmuneEmerging evidenceSpecialist-directed prescription product
Evaluate immunoglobulins, CBC, and exposures.
Slow recovery from infection
10% relevance
Evidence is disease-specific and not a general recovery enhancer.
ImmuneInsufficient evidenceAvoid self-use
Persistent infection symptoms need medical care.
Safety
Full safety detail.
Side effects
- Injection-site reaction
- Fatigue
- Headache
- Nausea
- Flu-like symptoms
- Rash
- Potential immune flare in susceptible patients
Contraindications
- Pregnancy and breastfeeding unless specialist-directed
- Autoimmune disease flare without specialist review
- Solid-organ transplant or immunosuppressive therapy without transplant-team approval
- Active malignancy without oncology coordination
- Use of research-grade injectable products
Interactions
Interaction records.
InfoSynergy
Zinc
Zinc deficiency can impair immune function, but high-dose zinc can cause copper deficiency.
Recommendation: Correct deficiency through standard dosing; avoid megadoses.
InfoSynergy
Vitamin D3
Vitamin D status is relevant to immune regulation but does not replace immunologic diagnosis.
Recommendation: Check and correct deficiency if clinically indicated.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
1- 1The efficacy of thymosin alpha1 as immunomodulatory treatment for sepsis: a systematic review of randomized controlled trialsNeeds sourceNo linkWu J et al. · Critical Care · 2016
Mortality signal favored thymosin alpha-1
Reviews & position papers
2- 2Thymosin alpha 1: A comprehensive review of the literatureNeeds sourceNo linkKing R et al. · World Journal of Virology · 2020
Multiple immune indications reviewed
- 3Thymosin alpha-1 treatment in chronic hepatitis BNeeds sourceNo linkZhao Y et al. · Expert Opinion on Biological Therapy · 2015
Immune-adjuvant role reviewed
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Thymosin Alpha-1 in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.