TB-500 5mg vs 10mg: Cost per mg, Vial Fill & Storage

Research use only. Not for human consumption. Not evaluated by Health Canada. This guide covers specifications, storage and documentation. It gives no dosing or usage guidance.

In short.

• Same peptide, same independent lab testing, a COA for each lot.
• The 10mg vial costs 36% less per mg: $8.90 against $14.00 at one-time prices. One 10mg vial is $50.99 cheaper than two 5mg vials.
• Once reconstituted, the whole vial is on one 30-day clock. Choose by how much material your work needs inside one window.

Side by side.

Prices in CAD as listed on 26 Sept 2026. Subscription pricing is 15% lower on both sizes, so the per-mg gap stays at 36%.

What's the same.

TB-500 is a synthetic peptide based on thymosin β4, a 43-amino-acid protein found in most vertebrate cells, where it binds and holds actin monomers. Some analytical studies define TB-500 as a short acetylated fragment of thymosin β4 that covers the parent protein's actin-binding motif, but the name is not used consistently across the market. The identity result on the COA for your lot is what confirms the molecule in the vial.

Vial size changes none of that. Every Vitaliti batch is made by solid-phase synthesis, carries its own lot code, and is tested by an independent third-party lab. The COA for your lot is available by email on request.

The 10mg vial is not a stronger version. It holds twice the material at the same specification.

What's different: cost per mg.

The 5mg vial is $69.99, or $14.00 per mg. The 10mg vial is $88.99, or $8.90 per mg. The larger vial costs 36% less for each milligram, a wider gap than the BPC-157 sizes (25%) or the GHK-Cu sizes (about 23%).

Put another way, the 10mg vial costs only $19.00 more than the 5mg vial for twice the material.

For 10mg of material, one 10mg vial saves $50.99 over two 5mg vials.

What's different: the storage window.

Sealed and lyophilized, both vials store the same way: 2–8°C, away from light. Vitaliti's stated window for a reconstituted vial is up to 30 days refrigerated, and that clock covers the whole vial once it starts.

The reason is general to peptides: a peptide's shelf life in solution is much shorter than as a lyophilized powder. Dry material waits; dissolved material does not.

So the useful line is 5mg per window:

• 5mg or less per window. A 5mg vial covers it for $69.99. A 10mg vial would cost $88.99 and leave material past its window. If only 5mg of a 10mg vial is used, that material cost $17.80 per mg, more than the 5mg vial's $14.00.
• More than 5mg per window. A 5mg vial is not enough on its own, and the alternative is two 5mg vials at $139.98. One 10mg vial at $88.99 costs less even if part of it goes unused.

Two 5mg vials keep one advantage: the second stays sealed and lyophilized until a later window.

Documentation.

Each vial is labelled with its lot code and expiration date. Vials from different orders may come from different lots. Request the COA for each lot you use at contact@vitalitipeptide.com, and keep it with your records.

For TB-500, the identity result on the COA is worth a look, because the name is used inconsistently. An identity test (by mass spectrometry, or by retention time against a reference standard) is how a lab confirms the vial holds the expected molecule and not a related one. The HPLC purity figure alone cannot tell you that. The guide to peptide purity explains how the tests on a COA fit together.

Which to choose.