Side-by-side comparison: effects, dosing ranges, side effects, regulatory status, and reconstitution.
Peptide A
Muscle Growth
Single-chain relaxin peptide analog with anti-fibrotic and cardioprotective activity.
Peptide B
Healing & Recovery
Synthetic fragment of Thymosin Beta-4 with potent tissue repair activity.
Typical vial
2 mg
Typical dose
1000-2000 mcg
Half-life
~2-3 hours
FDA status
Not FDA approved.
Typical vial
5 mg
Typical dose
2000-5000 mcg
Half-life
~6-8 hours
FDA status
Not FDA approved for human use.
B7-33 effects
TB-500 effects
B7-33 side effects
TB-500 side effects
B7-33 dosing ranges
Research / anti-fibrotic
1-2 mg · Daily (SubQ or IV in preclinical work) · Per research protocol
TB-500 dosing ranges
Acute injury healing
2000-5000 mcg · Twice weekly · 4-6 weeks
Maintenance and recovery
2000 mcg · Once weekly · 4-8 weeks
B7-33: Single-chain relaxin peptide analog with anti-fibrotic and cardioprotective activity. Typical dose 1000-2000 mcg. TB-500: Synthetic fragment of Thymosin Beta-4 with potent tissue repair activity. Typical dose 2000-5000 mcg. Both fall under the Muscle Growth and Healing & Recovery categories.
Stacking B7-33 with TB-500 is a protocol-design question best raised with a clinician — it depends on your goal, current bloodwork, and whether both peptides target overlapping mechanisms. Both peptides should be tracked independently with separate injection sites and timing. PinnyPeptide supports multi-peptide stacks with automatic injection site rotation.
B7-33 is typically dosed: Daily (SubQ or IV in preclinical work) for Research / anti-fibrotic. TB-500 is typically dosed: Twice weekly for Acute injury healing; Once weekly for Maintenance and recovery.
B7-33: Not FDA approved. TB-500: Not FDA approved for human use.
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