Frequently Asked Questions

We accept Visa, Mastercard, American Express, Discover, and Apple Pay. All payments are processed securely through Stripe with 256-bit SSL encryption.

Yes. Orders of 10+ vials of the same product receive automatic volume discounts. For 50+ vials or institutional orders, contact us for custom wholesale pricing.

Yes. Enter your discount code on the checkout page in the Discount Code section. Codes are applied to your subtotal before shipping.

Absolutely. We never see or store your card details. All payment processing is handled by Stripe, a PCI DSS Level 1 certified payment processor.

Research peptides are not subject to sales tax in most jurisdictions. If applicable, tax will be calculated at checkout.

Orders placed before 2:00 PM CST, Monday through Friday, ship the same business day. We use USPS Priority, FedEx 2-Day, and FedEx Overnight depending on the shipping tier selected.

Yes. All domestic orders over $200 qualify for free standard shipping. Expedited and overnight options are available at additional cost.

Yes. We offer Standard International (5–10 business days, $29.95) and Express International (3–5 business days, $49.95). International customers are responsible for customs duties and import fees.

All orders are shipped in plain, unmarked packaging with cold-chain insulation (insulated containers + gel ice packs) to maintain product integrity. No product descriptions are visible on the exterior.

Yes. A tracking number is emailed to you as soon as your shipment is picked up by the carrier. You can monitor your package in real time through the carrier's website.

All peptides are guaranteed at ≥99% purity via HPLC analysis. Every order includes a Certificate of Analysis (COA) with full chromatography and mass spectrometry data.

Yes. Every batch undergoes independent third-party testing for purity, identity (mass spec), endotoxin levels (LAL), and sterility where applicable.

A COA is a document that reports the results of analytical testing for a specific batch. It includes HPLC purity data, mass spectrometry results, batch number, test date, and analyst credentials. Every order includes a COA.

Yes. Enter your batch number on our Purity Guarantee page to view real-time COA data including purity percentage, test date, and expiry information.

Store lyophilized (powder) peptides at -20°C for long-term storage or 2–8°C for short-term use. Prepared solutions should follow supplier COA stability guidance—typically refrigerated (2–8°C) within documented laboratory stability windows.

We accept returns of unopened products within 30 days of delivery. Damaged or incorrect items are replaced at no cost. If third-party testing shows purity below 99%, we replace or refund regardless of whether the vial was opened.

If HPLC analysis of your received product shows purity below 99%, we will replace the order at no cost or issue a full refund. No questions asked.

Email info@mipeptidos.com with your order number and reason for return. We'll issue a Return Merchandise Authorization (RMA) number within one business day.

Once we receive and inspect your return, refunds are processed within 3–5 business days. Total timeline from return receipt to funds appearing: 5–10 business days.

Yes. Create a free account to earn 10 points per $1 spent, plus 500 bonus points on signup. Points can be redeemed for discounts on future orders.

You earn 10 points for every $1 spent. 100 points = $1 in rewards. Higher loyalty tiers (Elite, VIP) earn at increased rates. Points never expire.

No. You can checkout as a guest. However, creating a free account lets you earn rewards points, track orders, save addresses, and access order history.

Email info@mipeptidos.com or use our Contact page. We typically respond within 2 hours during business hours (Mon–Fri, 9 AM–6 PM CST).