How do I calculate peptide concentration after adding water?

Divide the amount in the vial by the volume of water you added. A 10 mg vial mixed with 2 mL gives 10 ÷ 2 = 5 mg/mL, which is the same as 5,000 mcg/mL.

How many units are in 1 mL on a U-100 syringe?

A U-100 insulin syringe is marked so that 100 units equal 1 mL. Each unit is 0.01 mL, so 0.25 mL reads as 25 units.

How do I convert mg to mcg?

Multiply milligrams by 1,000. 1 mg = 1,000 mcg, so 0.25 mg = 250 mcg. To go back, divide mcg by 1,000.

Can I convert units on the syringe back to an amount?

Yes. Divide the units by 100 to get mL, then multiply by the concentration. 20 units = 0.20 mL; at 5 mg/mL that holds 1 mg. The calculator does this when you type units into the units box.

Does adding more water change how much is in the vial?

No. The total in the vial stays the same. More water lowers the concentration, so the same amount takes up more volume and more units on the syringe.

Why is IU treated differently from mg?

IU measures biological activity, not weight, so there is no universal IU-to-mg rule. The calculator uses the IU count printed on your own vial label instead of guessing.

Does PeptideWhiz suggest doses?

No. PeptideWhiz never suggests or recommends an amount. Every number comes from you, and the tool only does the arithmetic. It is not medical advice.

Do I need an account to use the calculator?

No. The calculator is free and works without an account. An account only lets you save results to your stack and tracker.

Peptide Calculator

Vial and water math for Teriparatide, with a research record of published human trials. Math only, no suggested amounts.

Free · no account needed

Compound (Optional)

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units (U-100)

Vial Strength (Total mg of Your Vial)

Reconstitution Solution Added

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Results

Draw to

—units

Enter amount, vial and Reconstitution Solution

ConcentrationConc.

—mg/mL

Your dose

—mg

Doses / vial

—

More than 100 units (over 1 mL). This won't fit in a single U-100 syringe draw. Double-check your numbers or use more water / a smaller amount.

U-100 Syringe · 1 mL

Notes

PeptideWhizpeptidewhiz.app · research use only

Research use only (RUO). Results are math on the values you enter only, not a recommendation or prescription for human use. Not medical advice. Always verify your own measurements. Full disclaimer

About Teriparatide

Teriparatide is the first 34 amino acids of human parathyroid hormone, the part of the hormone that carries its activity. Given intermittently, it stimulates bone-building cells, which is the opposite of the effect of continuously high parathyroid hormone.

Research status

Teriparatide is FDA-approved as a prescription medicine (Forteo, plus later versions) for osteoporosis in people at high fracture risk. Trials compare it with placebo, bisphosphonates, denosumab and abaloparatide.

How the math works for any vial (concentration, U-100 units, mg and mcg) is explained step by step on the main peptide reconstitution calculator page. Read the full What is Teriparatide? guide for mechanism, trials and conditions researched.

What published studies used

Research record, not a recommendation or protocol

These are published human trials of Teriparatide from the PeptideWhiz study library. The last column quotes each study’s PubMed abstract word for word, so it shows what that study reported giving its participants under medical supervision. It is not advice, and the calculator never fills these numbers in on its own: you can copy one only by tapping its button and confirming.

Study	Year	Journal	As reported in the abstract	PubMed
Teriparatide Plus Zoledronic Acid for Osteogenesis Imperfecta: A Randomized Clinical Trial.	2026	JAMA	“Those in the active group received 20 μg of teriparatide daily by subcutaneous injection for 2 years followed by an infusion of 5 mg of zoledronic acid.”	PMID 42133304
Interim Effects of Zoledronate, Denosumab, or Teriparatide on Bone Microarchitecture in Type 2 Diabetes: A Pilot Trial.	2026	The Journal of clinical endocrinology and metabolism	“Participants were randomly assigned in a 1:1:1:1 ratio to receive zoledronate 5 mg annually, denosumab 60 mg every 6 months, teriparatide 20 µg daily, or only standard of care (calcium/cholecalciferol) for 72 weeks.”	PMID 41183496
Timing optimization of teriparatide dosing for postmenopausal osteoporosis: a randomized controlled trial.	2025	Journal of orthopaedic surgery and research	“Twenty-eight participants (aged 60-70 years, lumbar spine T-score ≤ -3.0) will be randomized in a 1:1 ratio to receive 20 µg/day of teriparatide via subcutaneous injection at either 08:00 or 20:00 for 12 weeks.”	PMID 40676595
Teriparatide Followed by Denosumab in Premenopausal Idiopathic Osteoporosis: Bone Microstructure and Strength by HR-pQCT.	2023	Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research	“Of 41 women enrolled in the parent teriparatide study (20 mcg daily), 34 enrolled in the HR-pQCT study.”	PMID 36335582
Sequential therapy with once-weekly teriparatide injection followed by alendronate versus monotherapy with alendronate alone in patients at high risk of osteoporotic fracture: final results of the Japanese Osteoporosis Intervention Trial-05.	2023	Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA	“Patients were randomly assigned (1:1) to receive the sequential therapy (once-weekly subcutaneous injection of teriparatide 56.5 μg for 72 weeks, followed by alendronate for 48 weeks) or monotherapy with alendronate for 120 weeks.”	PMID 36239756

Disclaimer: this table is an educational research record. It does not recommend, suggest or endorse any amount, schedule or use, and it is not medical advice. Decisions about any medicine belong with a licensed clinician.

Teriparatide calculator FAQ

What is Teriparatide?

Teriparatide is a parathyroid hormone analogue (PTH 1-34). Teriparatide is the first 34 amino acids of human parathyroid hormone, the part of the hormone that carries its activity.

Is Teriparatide approved?

Does this page suggest a Teriparatide dose?

No. The calculator dose field starts empty and PeptideWhiz never suggests, recommends or calculates an amount for anyone. The study table is a research record of what published trials reported, not a recommendation or protocol.

Where do the study numbers on this page come from?

Each row quotes the abstract of a published human trial (5 trials, 2023 to 2026) word for word, as indexed in PubMed, with a link to the PubMed record. Nothing is rounded, combined or converted.

How does the calculator work with a Teriparatide vial?

Pick Teriparatide in step 1 if you want it on your result card, then enter the vial amount printed on your own label and the water volume actually added. The tool divides one by the other for concentration and shows the matching U-100 syringe units for an amount you type. Pens and pre-filled syringes are already in liquid form and are not reconstituted.

Sources

Study rows: PubMed records linked in the table (abstracts checked against PubMed on October 31, 2026). Unit math: see the sources on the main calculator.

Reviewed by the PeptideWhiz team on October 31, 2026. For research and education only.