What is pentadeca arginate (PDA)?
If you are searching for pentadeca arginate dosage, you most likely have a vial and need to turn an amount into syringe units; that is the math this page handles. Pentadeca arginate, usually shortened to PDA, is a synthetic peptide of 15 amino acids (“pentadeca” means fifteen). It is marketed as a close relative of BPC-157, supplied as an arginate salt rather than the acetate salt that BPC-157 powder usually comes as.
A salt form is the counter-ion paired with the peptide in the dry powder. It can change how a powder handles and dissolves, and it slightly changes how much of the vial’s weight is the peptide itself. The PDA peptide has not been through an approval process, and supplier descriptions of its exact structure vary. This page makes no claims about effects in people and deals only with reconstitution math.
How much BAC water for a PDA vial?
Research vials are usually sold as 5 mg or 10 mg of freeze-dried powder. The mg in the vial stays fixed; the BAC water you add sets the concentration. The chart shows micrograms per unit on a U-100 syringe for common water volumes.
| BAC water | 5 mg vial | 10 mg vial |
|---|---|---|
| 1 mL | 50 mcg/unit 5 mg/mL | 100 mcg/unit 10 mg/mL |
| 2 mL | 25 mcg/unit 2.5 mg/mL | 50 mcg/unit 5 mg/mL |
| 2.5 mL | 20 mcg/unit 2 mg/mL | 40 mcg/unit 4 mg/mL |
| 5 mL | 10 mcg/unit 1 mg/mL | 20 mcg/unit 2 mg/mL |
Each cell shows mcg per unit on a U-100 syringe (100 units = 1 mL) and the resulting concentration.
Read across a row to compare vial sizes at the same water volume, or down a column to see how more water spreads the powder thinner. Volumes that divide evenly into the vial mg give the cleanest numbers. There is no single correct choice; what matters is that you enter the volume you actually used. The BAC water to peptide ratio guide explains how the chart is built.
Worked example: pentadeca arginate reconstitution in units
The calculator runs three steps. Vial mg ÷ water mL gives the concentration. The amount you enter ÷ that concentration gives the volume in mL. Volume in mL × 100 gives U-100 units. For example, if the amount you already have is 250 mcg, and the vial is a 5 mg vial with 2 mL of water added:
The math: 5 mg ÷ 2 mL = 2.5 mg/mL (2,500 mcg/mL), which is 25 mcg per unit. 250 mcg ÷ 2,500 mcg/mL = 0.1 mL = 10 units on a U-100 syringe.
That amount is an arbitrary figure picked because it comes out clean. It is not a suggestion. If your amount is in milligrams, switch the calculator unit or convert first; 1 mg = 1,000 mcg. The mg to mcg conversion guide covers that step.
Pentadeca arginate dosage: what the numbers mean
The pentadeca arginate dosage calculator converts an amount you bring into mL and syringe units for your vial size and the water you actually added. It does not set, suggest or check a dose, schedule or frequency, and there is no approved labeling for PDA that defines human amounts. Any pentadeca arginate dosage question belongs with product labeling and a qualified professional.
Units are the same size on every U-100 syringe: 100 units = 1 mL and 1 unit = 0.01 mL. A 0.3 mL or 0.5 mL syringe just holds fewer of them. You can check the calculator math by hand with the same formula.
PDA vs BPC-157
PDA and BPC-157 are sold as separate products, and the practical difference for this calculator is simple: each vial is entered by the mg printed on its own label. The peptide in a 5 mg PDA vial and a 5 mg BPC-157 vial is not guaranteed to be the same molecule or the same net peptide content, because the salt form and the exact sequence described by each supplier can differ. If you have a BPC-157 vial, use the BPC-157 reconstitution calculator instead.
BPC-157 appears on the FDA list of bulk drug substances that may present significant safety risks in compounding. That listing names BPC-157; it does not by itself describe PDA, and this page makes no claim either way about how PDA is classified.
Pentadeca arginate reconstitution notes from suppliers
Supplier directions vary, so the label on your vial comes first. Some suppliers specify bacteriostatic water; others list sterile water. Some product sheets say the arginate form dissolves readily with gentle swirling and should not be shaken, and many list one storage temperature for the dry vial and another after mixing. Enter the exact water volume you used so the unit count matches what is in the vial.
Is pentadeca arginate FDA-approved?
No. Pentadeca arginate is not an FDA-approved drug, and vials sold online are labeled for research use. There is no approved product to compare a research vial against, so the only numbers you can rely on are the mg on the label and the water you measured. A correct calculation cannot confirm identity, purity, sterility or stability; treat every result as arithmetic, not as a statement that a product is safe or suitable for any use.
Pentadeca Arginate (PDA) FAQ
What does PDA stand for in peptides?
PDA stands for pentadeca arginate. Pentadeca refers to the 15 amino acids in the peptide, and arginate refers to the salt form it is supplied in.
Is PDA the same as BPC-157?
No. PDA is marketed as a BPC-157-related peptide in an arginate salt form, but it is sold as a separate product. Enter each vial by the mg on its own label.
How much BAC water do you add to a PDA 10mg vial?
There is no single required volume. The chart shows how 1, 2, 2.5 and 5 mL change the micrograms per unit. Follow the product labeling, then enter the volume you used in the calculator.
Does this page give a pentadeca arginate dosage?
No. It converts an amount you already have into mL and U-100 syringe units for your vial and water volume. It does not recommend a dose, schedule or frequency.
Can I use the BPC-157 chart for PDA?
The math is identical for any mg vial, but select the compound that matches your label so your record and calculator settings stay accurate.