Frequently Asked Questions

Peptides are short chains of amino acids that act as building blocks of proteins.

Yes. U.S. companies may sell peptides if they are clearly labeled "For Research Use Only. Not for human or diagnostic use." Under the Federal Food, Drug, and Cosmetic Act (21 U.S.C. §321(g)(1)), a product is considered a "drug" only if it is intended for human or animal use. If labeling and promotion remain strictly for research use, the FDA does not regulate them as drugs.

As a research facility, it is your responsibility to check and comply with all local and regional laws in your area regarding the purchase and use of these materials.

• 21 U.S. Code §321(g)(1) – Definition of Drug
• 21 CFR §809.10(c)(2)(i) – RUO Labeling Rule
• FDA RUO Guidance (2013)

This information is for educational purposes only and does not constitute legal advice.

"For Research Use Only" (RUO) means the product is intended exclusively for laboratory research, scientific investigation, and educational purposes. RUO products are not approved for human or animal consumption, diagnostic procedures, or therapeutic applications.

This designation is consistent with FDA labeling guidelines under 21 CFR §809.10. Researchers are responsible for complying with all applicable regulations. For full details, see our Terms of Use.

No. Products are sold strictly for laboratory and research use. They are not intended for human or veterinary consumption, food, drug, or household use.

You must be 21 years of age or older and agree that products are for research use only. Checkout requires a registered account.

Usage instructions cannot be provided by Limitless Compounds, as all of our products are for research and testing only. All products are guaranteed for purity and identification.

Our peptides are intended for research purposes only and are not for human consumption. They are tested for quality and purity and meet the standard for research use.

High-Performance Liquid Chromatography (HPLC) is an analytical technique that separates, identifies, and quantifies each component in a peptide sample. It is the industry-standard method for determining peptide purity because it can detect impurities at very low concentrations.

When a peptide undergoes HPLC testing, the sample is dissolved and passed through a column under high pressure. Each component elutes at a different time, producing a chromatogram that shows the relative abundance of the target peptide versus any contaminants. A purity reading of 98% or higher is generally considered research-grade. Limitless Compounds products are tested using HPLC, and results are documented in each product's Certificate of Analysis when available.

A Certificate of Analysis (COA) is an official document issued by a testing laboratory that reports the results of quality-control tests performed on a specific batch of product. It typically includes purity percentage, molecular weight confirmation, batch number, and the testing methods used.

COAs provide transparency and allow researchers to verify that the materials they receive meet the specifications listed on the product label. When a COA is available for a product, you can view and download it from that product's detail page in our shop.

Limitless Compounds peptides are manufactured to a minimum purity of 98%, with most products exceeding 99% purity as verified by independent HPLC and mass spectrometry analysis. Batch-specific purity data is available on each product's Certificate of Analysis when provided.

We work with independent third-party laboratories and encourage customers to conduct their own verification testing. Purity results for individual batches appear on product detail pages when a COA is available.

Yes. When Certificates of Analysis are available, they are linked from the relevant product detail page. Search our shop for your product to view HPLC purity data, mass spectrometry results, and other quality metrics for the batch on file.

If you cannot locate a COA for your product, contact us and we will help.

Lyophilized (freeze-dried) peptides should be stored at -20°C or colder in a sealed container protected from moisture and light. Under these conditions, most peptides remain stable for 12 months or longer. Reconstituted peptides should be refrigerated at 2–8°C and used within 4–6 weeks.

Avoid repeated freeze-thaw cycles, which can degrade peptide integrity. If you need to use a reconstituted peptide over multiple sessions, consider aliquoting the solution into single-use portions.

Some peptides may require refrigeration even in lyophilized form—follow the guidance on your product label.

Lyophilized peptides are in a dry, freeze-dried powder form as shipped. Reconstituted peptides have been dissolved into a liquid solution using bacteriostatic water. Lyophilized peptides have a longer shelf life and greater stability, while reconstituted peptides are ready for immediate use but must be refrigerated.

All Limitless Compounds peptides ship in lyophilized form for maximum stability during transit and storage. Researchers reconstitute them as needed for their specific protocols.

Reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide powder into a liquid solution using bacteriostatic water or another appropriate solvent. This step is necessary before the peptide can be accurately measured and used in research applications.

The volume of solvent added determines the final concentration of the solution.

We aim to get your order out as quickly as possible. Orders that are not awaiting synthesis typically ship the next business day.

We ship packages based on your location, and tracking numbers are provided once shipped.

Please note that while we do our best to ensure timely delivery, unexpected delays such as severe weather or carrier issues may impact transit times. Delivery times vary based on location and shipping provider.

We currently focus on domestic fulfillment. Contact us if you have questions about delivery to your region or need help before placing an order.

Sign in and open the order from Account → Orders. Tracking appears on the order page once the shipment has a carrier link.

Payment options are shown at checkout. We accept major credit and debit cards; additional methods may be added over time.

Retail prices are set per SKU in our catalog. Wholesale reference pricing from our fulfillment partner is used internally and does not appear on the storefront.

We automatically charge and withhold applicable sales tax on orders delivered to addresses within the same state where Limitless Compounds holds a presence. For orders shipped elsewhere, you are responsible for any sales taxes or other taxes that may apply. See our Terms of Use for details.

Shipping rules and costs may be finalized separately; checkout collects your shipping address today.

We accept returns for any reason within 30 days of purchase. Products must be unused and in their original packaging. To start a return, contact us. Once approved, we will send return shipping instructions. Refunds are processed to your original payment method within 5–7 business days after we receive your items.

We also accept returns for manufacturing defects, workmanship issues, or fulfillment mistakes (such as incorrect products shipped).

You may cancel an order at any time before it ships. If an item is out of stock, we will notify you and you can cancel before fulfillment. Full return and refund terms are in our Terms of Use.

You can reach our customer service team through our contact page. We are here to assist you with any questions or concerns you may have and typically respond within one business day.