Cholecalciferol

Vitamin D3 20,000 IU is supplied as lyophilized powder under nitrogen. Typical reconstitution is in sterile or bacteriostatic water; the exact concentration depends on your protocol. Our free reconstitution calculator computes mL per dose and insulin-syringe units from any combination of vial size, water volume, and target dose.

Batch D3-2608 of Vitamin D3 20,000 IU is verified at USP HPLC main-peak purity, with confirmation of molecular weight by LC-MS and endotoxin screening by LAL assay. One vial of every batch is also shipped to an independent US-based third-party lab for blinded re-verification. The full COA — including the chromatogram, mass spec trace, and third-party report — is bundled with your order as a downloadable PDF.

All orders ship cold-chain via DHL Express from our Guangzhou facility. Cold-pack is validated to hold under 8°C for 96 hours. Customs duties are prepaid by us — no surprise charges on delivery. Estimated transit time is 7-10 business days door to door. Tracking number is emailed when the shipment is scanned by DHL.

ACH bank transfer (2% off, recommended), USDC / BTC / ETH crypto (5% off), Zelle, CashApp, Venmo, or wire transfer for institutional orders. We do not accept credit cards because card processors prohibit research-peptide merchants in their terms of service. Full payment-method details are on the shipping & payment page.

Yes. Every item in our supplies & adjuncts category is stocked as a research reagent — not for human or veterinary use. Handle per your institution's biosafety and storage protocols.

Store lyophilized product at −20°C long-term or 2–8°C for near-term use. See the product description for reconstituted stability, light sensitivity, and any protocol-specific handling notes.

Yes — every supplies-category item ships in the same cold-chain packaging as our peptides (sealed, gel-ice packed, validated under 8°C for 96 hours). Product page details apply.