This website contains information about laboratory compounds intended strictly for in vitro research and development purposes by qualified scientific personnel. These compounds are not drugs, dietary supplements, cosmetics, or medical devices, and are not intended for human or animal use of any kind. You must be 21 years of age or older to enter.
For In Vitro Laboratory Use Only — Not for Human or Veterinary Use
The Compound Index
Verified compounds. Transparent standards.
For in vitro laboratory research use only. Croix Peptides supplies verified, high-purity polypeptide compounds to qualified laboratories and institutions. These compounds are not drugs, supplements, or finished products of any kind, and are not intended for human or animal administration. Every lot is independently analyzed prior to fulfillment.
≥99% Purity
Minimum threshold confirmed by HPLC and mass spectrometry.
Third-Party Verified
Independent analysis on every compound lot we fulfill.
Lot-Specific COAs
Certificate of Analysis documentation available for each product.
Controlled Fulfillment
Temperature-aware packaging with discreet laboratory shipping.
Catalog
All Compounds
Batch Documentation
All compounds are supplied exclusively as laboratory chemicals for in vitro research and development. Not for human or animal use under any circumstance. Certificate of Analysis available for every product.
Quality by Design
From raw material verification to final packaging, every batch is produced under rigorous controls and independent testing.
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Third-Party VerifiedThird-Party Verified
Every compound lot is independently analyzed by accredited third-party laboratories. Certificate of Analysis documentation is available for each product.Every compound lot is independently analyzed by accredited third-party laboratories.
≥99% Purity≥99% Purity
All polypeptide compounds meet a minimum purity threshold of ≥99% as confirmed by HPLC and mass spectrometry analysis.Minimum purity threshold confirmed by HPLC and mass spectrometry analysis.
Controlled FulfillmentControlled Fulfillment
Temperature-controlled packaging and discreet shipment protocols maintain compound integrity from our facility to the receiving laboratory.Temperature-controlled packaging and shipment protocols.
Regulatory ComplianceCOA Available
All compounds are sold strictly as laboratory research chemicals in accordance with applicable federal and state regulations. They are not approved, intended, or labeled for human or veterinary use of any kind.Documentation available for every product.
Support
FAQ
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In Vitro Laboratory Use Only
Third-Party Verification
Certificate of Analysis Library
Every lot is independently analyzed by Janoshik Analytical. Each report below can be verified directly with the testing laboratory using the verification key. COAs for compounds not listed here are available on request.
Illustrative graphic. Analytical data below is taken from the batch reports issued by Janoshik.
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In Vitro Laboratory Use Only
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Shipping Information
By completing this order, the Purchaser affirms they are 21 years of age or older, a qualified laboratory professional or researcher, and that all compounds will be used exclusively for in vitro laboratory research and development in compliance with applicable laws and regulations. Purchaser expressly acknowledges and agrees that these compounds are NOT drugs, dietary supplements, cosmetics, or medical devices, and are STRICTLY PROHIBITED from human consumption, human application, or any form of veterinary or animal use. Any use other than qualified in vitro laboratory research is a direct violation of these Terms of Sale.
Order Summary
Subtotal$0.00
Shipping$12.00
CA Sales Tax (9.375%)$0.00
Total$0.00
Payment instructions provided upon order placement. All sales final. For laboratory use only.
Order Received
Your laboratory order has been submitted
Order Number
#AP-000000
Total Due
$0.00
Remit Payment
Please remit payment for the total amount above using any of the following methods. Include your order number in the payment memo.
Zelle(408) 427-5582
Venmo(408) 427-5582
Cash App(408) 427-5582
PayPal(408) 427-5582
Reference order number #AP-000000 in your payment memo.
These compounds are laboratory research chemicals only — not for human or animal use of any kind. Orders are processed within 1–2 business days following confirmed payment. For inquiries contact croixpeptides@gmail.com
Terms of Sale
Effective Date: January 1, 2026 · Croix Peptides LLC · San Jose, California
⚠ ALL PRODUCTS SOLD BY CROIX PEPTIDES LLC ARE SUPPLIED EXCLUSIVELY FOR QUALIFIED IN VITRO LABORATORY APPLICATIONS. NOT FOR HUMAN CONSUMPTION, CLINICAL USE, OR VETERINARY ADMINISTRATION. BY COMPLETING A PURCHASE YOU AGREE TO THESE TERMS IN FULL.
1. Acceptance of Terms
By placing an order with Croix Peptides LLC ("Croix Peptides," "we," "us," or "our"), you ("Purchaser") agree to be bound by these Terms of Sale. If you do not agree to these terms, do not place an order. These terms constitute a legally binding agreement between you and Croix Peptides LLC, a California limited liability company.
2. Age Requirement
You must be 21 years of age or older to purchase from Croix Peptides LLC. By placing an order, you represent and warrant that you are at least 21 years of age. Croix Peptides LLC reserves the right to cancel any order where age verification cannot be confirmed.
3. Intended Use — Research and Laboratory Use Only
All compounds offered by Croix Peptides LLC are sold strictly for qualified in vitro laboratory and research applications only. By purchasing, Purchaser represents and warrants that:
All purchased compounds will be used exclusively for in vitro laboratory research in compliance with all applicable federal, state, and local laws and regulations.
Purchaser is a qualified laboratory professional, researcher, or representative of a licensed research institution.
Purchased compounds will not be used for human consumption, self-administration, clinical treatment, or veterinary use.
Purchaser will handle all compounds in accordance with applicable institutional biosafety protocols.
These products are laboratory research chemicals only. They are NOT drugs, dietary supplements, cosmetics, foods, or medical devices. They have NOT been evaluated by the U.S. Food and Drug Administration and are not intended to diagnose, treat, cure, mitigate, or prevent any disease or condition in humans or animals. Any use of these compounds for human consumption, human application, or veterinary/animal purposes of any kind is a material breach of these Terms of Sale and is strictly prohibited.
4. California Sales Tax
Croix Peptides LLC is headquartered in San Jose, California and is required to collect California state sales tax on applicable orders. The applicable sales tax rate for San Jose, California is 9.375%, which includes the California state base rate of 7.25% plus applicable county and district taxes. Sales tax is calculated on the order subtotal and displayed prior to order submission. Croix Peptides LLC remits collected sales tax to the California Department of Tax and Fee Administration (CDTFA) in accordance with applicable law.
5. Pricing and Payment
All prices are listed in U.S. dollars. Prices are subject to change without notice. Payment is due in full at the time of order via the payment methods displayed at checkout (Zelle, Venmo, Cash App, or PayPal). Orders are not processed until payment is confirmed. Croix Peptides LLC reserves the right to cancel any order at its sole discretion.
6. All Sales Final — No Refund Policy
Due to the nature of laboratory compounds and regulatory requirements, ALL SALES ARE FINAL. Croix Peptides LLC does not accept returns or issue refunds once an order has been processed and shipped. In the event of a fulfillment error on our part (wrong item shipped), Croix Peptides LLC will, at its sole discretion, issue a replacement or store credit. Purchaser assumes all risk upon delivery.
7. Shipping and Fulfillment
Orders are typically processed and shipped within 1–2 business days following confirmed payment receipt. Croix Peptides LLC ships within the United States. Shipping times are estimates only and are not guaranteed. Croix Peptides LLC is not responsible for delays caused by carriers, customs, or circumstances beyond our control. Risk of loss transfers to Purchaser upon carrier pickup.
8. Compliance with Laws
Purchaser is solely responsible for ensuring that the purchase, possession, and use of any compound ordered from Croix Peptides LLC complies with all applicable federal, state, and local laws and regulations in Purchaser's jurisdiction. Croix Peptides LLC makes no representations regarding the legality of any compound in any jurisdiction outside the United States.
9. Limitation of Liability
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, CROIX PEPTIDES LLC SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES ARISING OUT OF OR RELATED TO THE PURCHASE OR USE OF ANY PRODUCT. CROIX PEPTIDES LLC'S TOTAL LIABILITY SHALL NOT EXCEED THE AMOUNT PAID BY PURCHASER FOR THE APPLICABLE ORDER. CROIX PEPTIDES LLC ASSUMES NO LIABILITY FOR ANY MISUSE OF SUPPLIED COMPOUNDS OUTSIDE OF QUALIFIED LABORATORY SETTINGS.
10. Governing Law
These Terms of Sale shall be governed by and construed in accordance with the laws of the State of California, without regard to its conflict of law provisions. Any disputes arising under these terms shall be subject to the exclusive jurisdiction of the state and federal courts located in Santa Clara County, California.
11. Contact
Croix Peptides LLC · San Jose, California · croixpeptides@gmail.com
Privacy Policy
Effective Date: January 1, 2026 · Croix Peptides LLC · San Jose, California
1. Introduction
Croix Peptides LLC ("Croix Peptides," "we," "us," or "our") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you visit our website and place orders. By using our website, you consent to the practices described in this policy.
2. Information We Collect
We collect the following information when you place an order:
Name, email address, and phone number
Shipping address (street, city, state, ZIP code, country)
Order details including items purchased and transaction amounts
Payment confirmation (we do not store payment account numbers or credentials)
We do not collect payment card numbers, bank account numbers, or payment app credentials. Payments are processed directly through third-party services (Zelle, Venmo, Cash App, PayPal).
3. How We Use Your Information
We use the information we collect to:
Process, fulfill, and ship your orders
Send order confirmations and shipping notifications
Respond to inquiries and provide customer support
Comply with applicable legal obligations, including California sales tax reporting
Maintain records as required by applicable law
4. California Privacy Rights (CCPA)
As a California-based business, we comply with the California Consumer Privacy Act (CCPA). California residents have the right to:
Know what personal information we collect and how it is used
Request deletion of personal information we hold about you
Opt out of the sale of personal information (we do not sell personal information)
Non-discrimination for exercising any CCPA rights
To exercise any of these rights, contact us at croixpeptides@gmail.com. We will respond to verified requests within 45 days as required by law.
5. Information Sharing
We do not sell, trade, or rent your personal information to third parties. We may share information with:
Shipping carriers solely for the purpose of order fulfillment
Service providers who assist in operating our website (e.g., form processing services), bound by confidentiality obligations
Law enforcement or regulatory authorities when required by applicable law
6. Data Retention
We retain order and customer information for a minimum of 4 years as required for California sales tax compliance and general business record-keeping. You may request deletion of your personal data subject to legal retention requirements by contacting us at croixpeptides@gmail.com.
7. Security
We implement reasonable administrative and technical measures to protect your personal information. However, no method of transmission over the internet is 100% secure. We cannot guarantee absolute security of your data.
8. Cookies
Our website uses session storage solely to maintain your age verification status during your visit. We do not use tracking cookies, advertising cookies, or third-party analytics cookies.
9. Changes to This Policy
We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated effective date. Continued use of our website after any changes constitutes acceptance of the updated policy.
10. Contact Us
For privacy-related inquiries or to exercise your California privacy rights: Croix Peptides LLC · San Jose, California · croixpeptides@gmail.com
In Vitro Laboratory Use Only
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In Vitro Laboratory Use Only
Our Story
Built on Precision and Purpose
Croix Peptides was founded on a straightforward premise: the scientific community deserves access to high-purity polypeptide compounds without compromise on quality, transparency, or integrity.
We operate out of San Jose, California, supplying verified laboratory compounds to qualified researchers and institutions across the country. Every compound we carry is independently analyzed before fulfillment — because in laboratory science, purity is not negotiable.
Our Mission
"To advance the accessibility of verified, high-purity polypeptide compounds for the qualified scientific community — with uncompromising standards at every step."
≥99%
Minimum Purity Standard
15
Verified Compounds Available
COA
Available on Every Product
What Drives Us
Our Core Values
01
Uncompromising Purity
Every compound we supply meets a minimum threshold of ≥99% purity, confirmed by independent third-party HPLC and mass spectrometry analysis. We do not cut corners on verification because your work depends on it.
02
Full Transparency
Certificate of Analysis documentation is available for every product we carry. We believe researchers should have complete visibility into the compounds they work with — no exceptions.
03
Competitive Accessibility
High-quality laboratory compounds should not come with inflated price tags. We price our catalog competitively and transparently so that purity and affordability are never in conflict.
04
Regulatory Integrity
We operate in full compliance with applicable federal and California state regulations. All compounds are supplied exclusively for qualified in vitro laboratory use, and we hold our customers to the same standard.
Ready to explore our catalog?
Browse our full range of verified laboratory compounds — from GLP-1 receptor agonists to growth hormone peptides and longevity compounds.
For order inquiries, COA requests, product questions, or any other assistance, reach us directly by email. We respond to all inquiries within one business day.
croixpeptides@gmail.com
Response time: Within 1 business day · Mon–Fri
Order Support
Have a question about an existing order? Email us with your order number (e.g. #AP-123456) and we'll get back to you as quickly as possible.
croixpeptides@gmail.com
Certificate of Analysis
Need a COA for a specific compound or lot? Email us with the product name and your order number and we'll send it over promptly.
croixpeptides@gmail.com
Payment Support
We accept Zelle, Venmo, Cash App, and PayPal. If you have any issues with payment or need to confirm receipt, contact us at the email below with your order number as reference.
croixpeptides@gmail.com
Zelle
(408) 427-5582
Venmo
(408) 427-5582
Cash App
(408) 427-5582
PayPal
(408) 427-5582
All compounds supplied by Croix Peptides LLC are laboratory research chemicals intended exclusively for qualified in vitro laboratory applications. They are strictly prohibited from human consumption, human application, or any veterinary/animal use under any circumstance.
