TB-500 Calculator: Dosage & Reconstitution Guide

TB-500 is commonly discussed alongside a loading-phase protocol structure, where doses are administered more frequently for an initial period before dropping to a lower maintenance frequency. This structure makes accurate reconstitution math especially important — since you're often recalculating vial duration and dose timing across two different phases rather than a single flat schedule. This guide covers the formula, a worked example, and the practical details around loading-phase planning and storage.

This article is for general education only. It is not medical advice. TB-500 is not an FDA-approved drug and is intended for research purposes. Consult a licensed healthcare provider before using any peptide.

The Reconstitution Formula

Concentration (mg/mL) = Total TB-500 in vial (mg) ÷ Bacteriostatic water added (mL)
Units to draw = (Target dose in mcg ÷ (Vial mg × 1000)) × Water added (mL) × 100

Worked Example

Suppose you have a 5mg vial of TB-500, reconstituted with 2mL of bacteriostatic water, and your target dose is 250mcg.

Units to draw = (250 ÷ 5,000) × 2 × 100 = 10 units

So you'd draw 10 units on a U-100 syringe per dose. A TB-500 calculator automates this so you only need to enter your vial strength, water volume, and target dose — no manual arithmetic required. If the mg-to-mcg step is still unclear, our conversion guide covers that separately.

Understanding the Loading Phase Structure

TB-500 protocols are frequently discussed in two phases:

• Loading phase — typically a period of more frequent dosing (often weekly) for the first several weeks
• Maintenance phase — a reduced dosing frequency (often every 2–4 weeks) that follows the loading phase

This two-phase structure directly affects your vial math, because the number of doses your vial needs to last changes between phases. A vial calculated to last a fixed number of weeks during loading will stretch much further once you drop to maintenance frequency — which means your reconstitution volume decisions should account for both phases, not just the initial one.

Worked Example — Vial Duration Across Phases

Say you have a 5mg vial reconstituted with 2mL of water, dosing 250mcg per injection (10 units, from the example above).

Total doses in vial = 5,000mcg ÷ 250mcg = 20 doses

If your loading phase uses 1 dose per week for 4 weeks, that's 4 doses used, leaving 16 doses remaining. At a maintenance frequency of 1 dose every 2 weeks, those remaining 16 doses would last an additional 32 weeks. Planning this out in advance — rather than reconstituting one vial at a time without a duration estimate — helps you decide whether a 5mg or 10mg vial makes more sense for your intended timeline.

How to Reconstitute TB-500

1. Bring the vial and bacteriostatic water to room temperature.
2. Sanitize both vial tops with an alcohol swab.
3. Draw your chosen volume of bacteriostatic water.
4. Inject the water slowly down the inside vial wall to minimize foaming.
5. Swirl gently until fully dissolved — never shake.
6. Label the vial with the reconstitution date and calculated concentration.
7. Store refrigerated, protected from light.

For more detail on this general process, see our full reconstitution guide.

TB-500 vs. BPC-157 Stack Dosing

TB-500 is sometimes used alongside BPC-157 as part of the same protocol. If you're calculating a stack, treat each peptide's reconstitution and dosing math independently — the two compounds have different typical vial strengths and dose ranges, and combining them into a single calculation risks conflating two separate numbers. See our BPC-157 dosage calculator guide for that compound's specific formula walkthrough, and calculate each one's syringe draw separately even if you're injecting them close together.

Storage After Mixing

Once reconstituted, TB-500 should be refrigerated and used within the timeframe specified in your supplier's product documentation. Watch for cloudiness, discoloration, or visible particles, which are signs a vial should no longer be used regardless of how much time has passed since mixing.

Common Mistakes With TB-500 Dosing

• Not planning vial size around the two-phase structure. A vial sized only for the loading phase may leave you reconstituting a new one sooner than expected once you enter maintenance dosing.
• Miscalculating mg-to-mcg. As with any peptide, this is the most common source of a significant dosing error.
• Combining TB-500 and BPC-157 math into a single calculation. Each compound needs its own independent formula, even in a shared protocol.
• Losing track of which phase you're in. Since dosing frequency changes between loading and maintenance, keeping a written log of which phase applies helps avoid defaulting back to the more frequent schedule out of habit.

Frequently Asked Questions

How is TB-500 dosing frequency different from a standard peptide protocol? The commonly discussed loading-then-maintenance structure means dosing frequency decreases partway through a protocol, which is different from peptides dosed at a single consistent frequency throughout. This is a general pattern often referenced for TB-500 — always base your actual schedule on your specific protocol source.

Can I use a standard peptide calculator for TB-500's two-phase dosing? Yes — the reconstitution and syringe-draw formula itself doesn't change between phases. What changes is how often you're using it. A TB-500 dosage calculator that also estimates total doses per vial can help you plan vial size around both phases in advance.

How much bacteriostatic water should I use for TB-500? This depends on your target dose and preferred syringe reading. Since a single vial may need to serve both loading and maintenance phases, it's worth calculating total doses per vial before deciding on a water volume, so the resulting unit count stays practical across both frequencies.

Is it safe to combine TB-500 and BPC-157 in the same vial? This is a protocol design decision, and combining peptides in a single vial requires tracking two separate concentrations within a shared volume — similar to combined-vial stacking with other peptide pairs. If you choose to do this, calculate both compounds' concentrations independently before combining.

Final Thoughts

TB-500's commonly discussed loading-then-maintenance structure adds a planning layer beyond a standard single-frequency peptide protocol — your vial size and reconstitution volume ideally account for both phases from the start. Running your numbers through a TB-500 calculator before you begin, rather than recalculating reactively partway through, makes it easier to choose a vial size and water volume that carries you through the full protocol.

This article is for general education only. It is not medical advice. TB-500 is not an FDA-approved drug and is intended for research purposes. Consult a licensed healthcare provider before using any peptide.