Return Policy

30-day returns

Unopened products may be returned within 30 days of delivery for a refund of the product price. Shipping costs are non-refundable unless the return is due to our error.

How to return

Contact hello@lenglabs.com with your order number before returning any material. Do not ship research materials back without prior authorization. Returned items must be unopened, in original packaging, and in resalable condition.

Non-returnable items

Opened or tampered products cannot be returned for safety and integrity reasons. Perishable cold-chain items, if any, are non-returnable.

Damaged or missing orders

Report damage or loss within 7 days of delivery with photos of the packaging. We will replace or refund at our discretion after review.