TB-500 Side Effects
Research Only
FM
Reviewed by Fat Man in the Arena · Updated March 2026
Important safety information. This page covers known and reported side effects of TB-500. This is not a complete list. Always discuss potential risks with your healthcare provider before starting any peptide protocol. Full medical disclaimer.
Known side effects
The following side effects have been reported in research studies and user reports for TB-500:
- Headache
- Mild nausea
- Lethargy
- Limited human safety data
Severity and frequency
Limited clinical data is available for TB-500. Side effect frequency and severity are based on available research and anecdotal reports. More data is needed for definitive safety profiles.
When to seek medical attention
Contact your healthcare provider immediately if you experience:
- Severe or persistent symptoms that do not improve
- Signs of an allergic reaction (rash, swelling, difficulty breathing)
- Severe abdominal pain
- Changes in vision or neurological symptoms
- Any symptom that concerns you
Risk factors
Side effect risk may be higher in certain populations. Discuss your complete medical history with your doctor, including:
- Pre-existing medical conditions
- Current medications (drug interactions)
- Pregnancy or plans to become pregnant
- History of allergic reactions to peptides or similar compounds
- Note: TB-500 is a research compound without established human safety data from FDA-approved clinical trials
Research references
- Thymosin beta4 promotes dermal healing — Annals of the New York Academy of Sciences (2007) [PubMed]
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