DHEA Reconstitution Calculator
DHEA (Dehydroepiandrosterone, adrenal androgen precursor) is listed in the Hormone category of The Longevity Archive, with a half-life of Short for DHEA itself, a few hours. The sulphate form circulates far longer, around 10 to 20 hours, and is what laboratories usually measure. (about 15 hr). Enter what is on the DHEA vial label, the bacteriostatic water you add, and the amount per draw you were given. You get the draw snapped to a real mark on your syringe, whether that is an insulin barrel in units or a 3 or 5 mL luer barrel in millilitres, the mixing steps, draws per vial and a printable label. The tool converts a number you already have; it never sets one. Read the DHEA research profile for the evidence, mechanism and legal status.
What is in the vial
Common vial sizes.
Bacteriostatic water you add
This changes how concentrated the vial is, not how much peptide is in it. 2 mL is the most common. A standard vial holds about 3 mL; the larger options are for blends and big vials that come in bigger glass.
Amount per draw
Research peptides are usually dosed in micrograms.
Syringe
Insulin barrels are printed in units, where 100 units is 1 mL. Luer barrels are printed in millilitres. Pick the one in your hand.
0.3 mL insulin (30 units, half-unit marks)
Fill in the vial, the water and the amount per draw to see the result.
Half-life illustration
How DHEA would decay on a daily schedule
Two example draws of the same size, one 24 hours ago and one now, decaying by the database half-life of Short for DHEA itself, a few hours. The sulphate form circulates far longer, around 10 to 20 hours, and is what laboratories usually measure.. This shows the shape of the curve for a daily interval only. It is an illustration of exponential decay, not a schedule and not a recommendation; the size of the draw is arbitrary and the same in both.
How the math works for DHEA
Concentration equals the amount on the DHEA vial label, converted to micrograms, divided by the water volume in milliliters. The volume you draw equals the amount you enter divided by that concentration. Multiplying that volume by 100 converts it to units on a U-100 insulin syringe, and the calculator rounds to the nearest mark your syringe can show. Draws per vial is the total in the vial divided by the amount per draw.
Frequently asked questions
What is in a DHEA vial before reconstitution?
A lyophilized (freeze-dried) powder. The label states the total amount in the vial, for example a number of mg, not a concentration per mL. Concentration only exists after bacteriostatic water is added: the label amount divided by the water volume. The calculator does that division and then converts the amount you enter into a syringe volume.
How do syringe units work for DHEA?
Insulin syringes are marked in U-100 units, where 100 units equals 1 mL, on 0.3, 0.5 and 1 mL barrels. The calculator divides the DHEA concentration by 100 to get the amount in each unit, then divides the amount you enter by that figure to get the mark to pull to. The result is rounded to the nearest readable mark on the syringe you choose: half-unit marks on 0.3 mL, 1-unit marks on 0.5 mL, 2-unit marks on 1 mL.
How long can reconstituted DHEA be kept?
A multi-dose vial mixed with bacteriostatic water is commonly given a 28-day discard window, the USP 797 default, stored at 2 to 8 C and protected from light. Label the vial with the mix date and discard date; the calculator's print label does this. Cloudiness or floating particles mean the vial should not be used. Manufacturer or pharmacy labeling for DHEA takes precedence over the default window.
Related
Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. This calculator does not recommend a dose of DHEA. It only converts the numbers you enter into a volume. The Longevity Archive does not provide medical advice.