Is Splenin FDA approved?

Splenin is not evaluated or approved by the FDA. It is discussed for research and educational purposes only, not as medical guidance.

How is Splenin administered in research settings?

In research settings, Splenin is typically administered via the subcutaneous or intramuscular routes. PeptideBase does not provide dosing or administration instructions.

How is Vladonix administered in research settings?

In research settings, Vladonix is typically administered via the oral or subcutaneous routes. PeptideBase does not provide dosing or administration instructions.

Home›Research›Compare›Splenin vs Vladonix

Peptide Comparison

Splenin vs Vladonix

Q: What is the difference between Splenin and Vladonix?

Splenin: Spleen-derived tetrapeptide bioregulator; normalizes leukocyte and platelet production; modulates splenic immune cell activity Vladonix: Short peptide complex penetrates cell nuclei and modulates gene expression in thymic and T-lymphocyte cells. Promotes T-cell maturation, normalizes CD4/CD8 ratios, and supports cytokine balance.

Both are Immune & Thymic peptides.

Splenin

Spleen peptide bioregulator

RecoveryNot EvaluatedResearch Only

Half-life: Unknown

1 providers listed

Full Splenin profile →

Vladonix

thymus peptide bioregulator

LongevityResearch Only

1 providers listed

Full Vladonix profile →

Bottom line

Splenin and Vladonix are closely matched on the structured measures we track — availability, evidence, and regulatory status are similar.

Quick Verdict

Splenin

Vladonix

Which One Should You Choose?

Your goal	Better option
Stronger clinical evidence	Splenin
Oral administration option	Vladonix

Research summary only — not medical advice. Consult a qualified provider before making any decisions.

Side-by-Side Comparison

Splenin

Vladonix

Mechanism Family

Immune & Thymic

Half-life

Unknown

—

FDA Status

not evaluated

unknown

Admin Routes

subcutaneous, intramuscular

oral, subcutaneous

Availability

Research Only

Providers

1 listed

Avail. Notes

Russian peptide bioregulator from spleen (Khavinson Institute). Immunomodulatory. No FDA approval, no NDA or IND. Not on any FDA list. Research chemical in US only.

—

Research Evidence

Splenin

Review · 2 key studies · most recent 2022

Vladonix

Review · 1 key study · dated evidence base — most recent 2002

Research Citations

Splenin

Review2022 · International Journal of Molecular Sciences

Neuroepigenetic Mechanisms of Action of Ultrashort Peptides in Alzheimer's Disease

Review2020 · Stem Cell Reviews and Reports

Peptide Regulation of Cell Differentiation

Vladonix

Review2002 · Neuroendocrinology Letters

Peptides and ageing

About Splenin

Spleen-derived tetrapeptide bioregulator; normalizes leukocyte and platelet production; modulates splenic immune cell activity

Research Areas

immune restorationblood cell productionsplenic function support

About Vladonix

Short peptide complex penetrates cell nuclei and modulates gene expression in thymic and T-lymphocyte cells. Promotes T-cell maturation, normalizes CD4/CD8 ratios, and supports cytokine balance.

Research Areas

immune restorationT-cell supportthymic functionlongevityanti-aging

Safety Profile

Information below reflects published research data only — not medical advice. Consult a qualified provider before use.

Splenin

No established clinical contraindications. This is an investigational compound with limited human data and has not been evaluated by the FDA for safety in this context. Consult a qualified clinician.

Vladonix

Absolute Contraindications

Under clinical review

Being verified by our medical team before we display contraindications for this peptide.

Find Providers

Where to source these peptides

Providers offering

Splenin

1 listed

Browse directory →

Providers offering

Vladonix

1 listed

Browse directory →

PeptideBase lists providers for educational research purposes only. Always consult a qualified healthcare professional before obtaining or using any peptide.

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Educational research tools — not medical advice.