How long does reconstituted TB-500 last?

What the 28 day clock actually counts

The window starts when water enters the vial, not when you first draw from it. This is the single most common counting error. A vial mixed on the first of the month and left untouched for a week has already spent that week inside its window. Nothing about sitting unused resets it.

The reason is that the clock is measuring the preservative in the bacteriostatic water, not the peptide. Bacteriostatic water contains an agent that suppresses microbial growth, and its effectiveness degrades over time and with each needle entry. The 28 day figure is a conventional handling limit for a multi-dose vial under refrigeration, applied here the same way it is applied to other reconstituted peptides.

Practical consequence: write the mix date on the vial in permanent marker the moment you add water. Not the date of first use, not the date you received it. The date water went in. Without that number written down, the window is unenforceable and you are guessing.

The table on this page also shows what happens when the vial leaves the fridge, which is the part most readers underestimate.

What warmth costs

Refrigerated and room temperature are not two points on a gentle slope. The table shows 28 days against 2 days. That is a collapse, not a decline, and it reflects how quickly preservative effectiveness falls away when a vial is warm.

This matters for two ordinary situations. The first is travel. A vial that spends a stretch of days out of refrigeration has, for handling purposes, been running against the shorter clock during that time, and the longer refrigerated window does not simply resume when it goes back in the cold. The second is the countertop habit: mixing, dosing, and leaving the vial out until the next draw. Repeated over a course, that is the difference between the two figures in the table.

We are not going to tell you what to do with a vial that has been warm for an unknown period. That is a judgment about your own material and this site has no medical review. What the arithmetic tells you is that the warm window is short enough that ambiguity arrives fast.

Powder is the stable form

The third row of the table is the one to plan around. Unmixed powder held in a refrigerator lasts months to years, subject to whatever date the vendor put on it. The peptide is at its most stable dry. Reconstitution is the step that starts a clock, so the useful habit is to mix as late as possible and to mix only what the window can absorb.

TB-500 is sold in 2 mg, 5 mg and 10 mg vials, and listings show dose amounts of 1 mg, 2 mg, 2.5 mg and 5 mg. Put those together and the mismatch is easy to see. A small vial paired with a large dose amount is finished in very few draws. A 10 mg vial paired with a 1 mg dose amount has to survive many more draws, and if your intended schedule spreads those draws past 28 days, the remainder sits outside the window.

Water volume, typically 1 mL, 2 mL or 3 mL, changes how much you draw per dose but does nothing to the window. Adding more water does not buy more days.

What this page does not tell you

TB-500 is not approved by any regulator for human use. There is no reliable human pharmacokinetic data for it, so this site makes no claim about its half life, how long it takes to clear, or whether it accumulates with repeated dosing. Anyone quoting a precise duration in the body for this compound is not working from data we can verify.

Keep the two ideas separate. The window in the table is about the vial: how long a mixed, preserved, refrigerated solution is conventionally handled as a multi-dose container. It says nothing about how long anything persists in a person, and it is not a statement about effect, dosing or safety.

Questions about whether to use this compound, at what amount, and with what risks are clinical questions. This page does not answer them and is not reviewed by anyone qualified to. Take those to a clinician who can see your actual situation.

What we do not know

We hold no reliable human pharmacokinetic data for TB-500, so this site makes no claims about its half life, how long it takes to clear, or how it accumulates. The arithmetic below concerns concentration and volume only.

This page answers arithmetic and handling questions. It does not tell you what dose to take, what to expect, or whether anything is appropriate for you, and there is no medical review behind it.

Common questions

Does the 28 days start from first injection or from mixing?

From mixing. The window counts from the day bacteriostatic water was added to the vial, regardless of when you first drew from it. A vial that sat mixed and unused has still been spending its window. Label the vial with the mix date so the count is not a memory exercise.

Can I extend the window by freezing a mixed TB-500 vial?

We hold no computed figure for a frozen reconstituted vial, so this page gives no window for it. The three conditions with numbers are refrigerated solution, room temperature solution, and unmixed refrigerated powder. Anything outside those is unaddressed here rather than approved by omission.

My vial was out of the fridge overnight. Is it still good?

That is a question about your specific material and this site cannot answer it. What the numbers show is the size of the gap: 28 days refrigerated against 2 days at room temperature. Warm time runs against the shorter clock, and it does not undo itself when the vial goes back in the cold.

Does using more water make the vial last longer?

No. Water volume, whether 1 mL, 2 mL or 3 mL, changes the volume you draw per dose, not the handling window. The 28 day refrigerated figure applies to the mixed vial regardless of how dilute it is.

How long does TB-500 stay in your system?

We do not know, and this page will not guess. There is no reliable human pharmacokinetic data for TB-500, so this site makes no claim about half life, clearance or accumulation. The 28 day figure describes a vial in a fridge, not anything happening in a body.

What if my planned doses will not finish the vial in 28 days?

Then the leftover falls outside the window, which is a reason to think about vial size before mixing. TB-500 is sold in 2 mg, 5 mg and 10 mg vials, and dry powder in the fridge lasts months to years. Mixing the smaller amount you will actually get through is the arithmetic point; whether to do so is your call.