TRH (Protirelin) 25 mg vial
Prices from 3 vendors, and how much to draw for the commonly cited doses.
Read the regulatory status before you compare prices.
FDA-approved as Thyrel TRH for thyroid and pituitary testing. The manufacturer halted production in 2002 and the product is listed as discontinued in the US. Labelling for compounded TRH still appears on DailyMed, marked as not approved by FDA. Approved in Japan as protirelin tartrate injection.
What a 25 mg vial costs
Every vendor we track that lists this exact size, cheapest first. Sort order is price only; affiliate status never changes it.
Median $3.72, or $3.72 per mg, across the 2 vendors with an exact, in-stock price.
Testing checks: outside lab · HPLC purity · mass spec identity · batch COA · lab named
- Core PeptidesThyrotropin TRH$73.00
- Core Peptides ResearchThyrotropin TRH (25mg)$73.00
- Biotech PeptidesTRH Thyrotropin (Protirelin) (25mg)$93.00
| Vendor | Size | Price | Per mg | Availability | Checked | Link |
|---|---|---|---|---|---|---|
| Core Peptides Thyrotropin TRH | 25 mg | $73.00 | $2.92 | listed | Sep 27, 2026 | View |
| Core Peptides Research Thyrotropin TRH (25mg) | 25 mg | $73.00 | $2.92 | in stock | Sep 27, 2026 | View |
| Biotech Peptides TRH Thyrotropin (Protirelin) (25mg) | 25 mg | $93.00 | $3.72 | in stock | Sep 27, 2026 | View |
- Core Peptides: Stock not shown, left out of the range
How to mix a 25 mg vial
Find the column for the amount of water you added to the vial. The number is how far to draw on a U-100 insulin syringe, where 100 units is 1 mL. This is arithmetic on the label, not a recommended dose.
How to read an insulin syringe · How much water to add
| Dose | 1 mL water | 2 mL water | 3 mL water |
|---|---|---|---|
| 500 mcg | 2.0 units 50.0 doses/vial | 4.0 units 50.0 doses/vial | 6.0 units 50.0 doses/vial |
Calculating for
TRH (Protirelin)
Printed on the vial.
iPeptide Decoding does not recommend a dose. Enter the amount your clinician gave you, or pick a value from the reference range to model.
Same dose, different draw. Pick whichever is easiest to measure.
Multi-vendor comparison is a Pro feature.
Daily is 7. Twice weekly is 2.