Questions, answered

The one you use up within 28 days of opening. The Size Finder works it out from your weekly use.

Bac water has 0.9% benzyl alcohol so the vial can be re-entered; sterile water has no preservative and is single use.

Only when your peptide's documentation asks for a low-pH diluent. Most peptides use bac water.

No — the price is boxes × box price. 20 or more boxes of one size are quoted.

We confirm stock, the lot and shipping to your address first, then send the total. You pay only after you have seen it.

By e-mail or WhatsApp — the button you press on the order form decides: Send Email or Chat on WhatsApp.

Every day, 10:00–22:00 China Standard Time (UTC+8). We reply within one business day.

Yes. Everything in your order list goes into one request.

One box: 10 vials (30 mL: 25). We sell by the box only, not single vials.

United States: $9.90 per order, whatever the number of boxes — there is no free-shipping threshold. Other countries are quoted with your confirmation.

Each size page lists the lot, expiry, container and every release test; the COA PDF comes with your order.

Unopened: until the expiry on the vial, stored at 15–25 °C away from light. Opened: usually 28 days.

Ships within 1–3 business days after payment is received; if anything changes, we tell you before it ships. We send the tracking number and the lot COA when it does.

Tracked courier or postal service, chosen per order. The confirmation shows the shipping cost before you pay.

No. Bac water is a room-temperature product; it ships in standard packaging.

Contact us as soon as you can after delivery, with photos of the box and vials. Damaged in transit, wrong or missing items: we reship them. A quality problem with a product: we refund it in full, agreed with our sales team.

Diluents cannot be sent back for a change of mind once they have left us: we cannot know how a vial was stored or handled after that, so we cannot vouch for its sterility or pass it on to anyone else.