Frequently asked questions

<p>The <strong>serial number</strong> is printed on the box label, next to the barcode. The <strong>8-character verification code</strong> is under a scratch-off panel inside the box. Enter both on the <a href="https://nexabiotech.net" target="_blank" rel="noopener">verification portal</a>.</p>

<p>The serial number identifies the product and batch; the one-time code proves the unit is genuine. Counterfeiters can copy a printed serial, but they can't reuse a code that has already been consumed — so a copied serial won't pass.</p>

<p>Treat the product as suspect and <strong>do not use it</strong>. Every code works exactly once, so a previous verification means either the code was copied or the unit was sold before. Email <a href="mailto:sales@nexabiotech.net">sales@nexabiotech.net</a> with a photo of the packaging and where you bought it; we investigate within 2 business days.</p>

<p>The certificate of analysis (COA) for your batch includes the lab's identity (Lingda Laboratory), test date, analytical methods (HPLC purity, spectrometric identity), measured purity against our ≥ 99% release specification, and a report number. That report number can be checked independently at <strong>lingdalab.com</strong> — so you never have to take our word for it.</p>

<p>Every batch is analyzed by <strong>Lingda Laboratory</strong>, an independent third-party lab, before release. We never self-certify. Each report carries a number that can be verified online at lingdalab.com, and full COAs are downloadable per batch from every successful verification.</p>

<p>Our release specification is ≥ 99% purity by HPLC, with identity confirmed by spectrometry. The exact measured value for your vial appears on the verification result and in the batch COA — check yours rather than trusting a generic number.</p>

<p>Keep lyophilized products sealed, cool, dry, and away from light (2–8 °C is fine for most). The expiry date on your verification result applies to unopened, correctly stored units. Once reconstituted, follow your lab's standard handling procedures.</p>

<p>Qualified institutional and commercial research customers — universities, contract research organizations, and licensed laboratories — ordering in bulk. We do not sell to individuals or single-unit retail buyers, and we may ask for institutional documentation before fulfilling an order.</p>

<p>We ship bulk orders worldwide. Orders are typically dispatched within 14 days of confirmation, tracked and insured. <strong>The buyer is responsible for customs clearance</strong> in the destination country — including any import permits, duties, or taxes. Check your local import requirements for research compounds before ordering.</p>

<p>If verification fails, the product arrives damaged, or a batch is recalled, we replace or refund at no cost. For any other issue, contact us within 14 days of delivery.</p>

<p>It means our products are sold strictly as laboratory research materials. They are not intended for human or veterinary use — not for consumption, injection, diagnosis, treatment, or any clinical purpose — and they have not been evaluated by the FDA or any other regulator for such use.</p>

<p>No. Purchasing confirms you are a qualified researcher acquiring materials for laboratory research. Misuse is a breach of our terms, and products that have left a controlled research context cannot be returned for safety reasons.</p>

<p>Import and possession rules for research compounds vary by jurisdiction and can change. It is the purchaser's responsibility to confirm local regulations and secure any required import permits before ordering; we cannot provide legal advice.</p>