Only place I buy
Great customer service, top quality peptides with great shipping time! Definitely recommend!
By Beee
Tuesday, November 3, 2026 · Customer reviews of US businesses

The Fair Hearing score
Excellent
120 reviews
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Sigma Compounds stands at the forefront of the research peptide industry, offering premium peptides. We have established strong partnerships with manufacturers who ISO 9001:2008 standards, allowing us to offer our clients exceptional pricing without compromising on quality or purity. Our commitment to delivering top-notch products ensures that we remain a reliable resource for the scientific community, and we are delighted to share these savings with our valued customers
Sigma Compounds (sigmacompounds.com) has 120 customer reviews on The Fair Hearing, with an average rating of 4.9 out of 5.
120 approved reviews, newest moderated first
Great customer service, top quality peptides with great shipping time! Definitely recommend!
By Beee
This has been the best company for reliable peptides.
By Nathan
There are so many fly by night producers out there. Sigma has fair prices, and their products are top quality. Ordering is a breeze, and shipping is fast(not withstanding USPS incompetence! They earn your business!
By Matt I.
Package was nice and secure and package was nice. To early to tell if it works.
By Eric F.
Excellent quality products, trust worthy company with great customer service and quick delivery. My first choice!
By Bobby S.
Sigma Compounds is my go to company for researching peptides in Ehlers-Danlos Syndrome. All of the products are quality tested and I trust them fully. Matthew and/or Customer Service are easy to contact and reply promptly when I have had a question. Ordering is simple, the website is easy to navigate to find exactly what you need. Order fulfillment & shipping are prompt, products come beautifully & safely packaged, sealed, & sterile. I would only buy peptides from Sigma!
By Joan C.
Sigma Compound is the best research peptides company in the world and U.S. the books are top notch and extremely helpful "Peptides made simple usage, dosing, cycling and reconstitution encyclopedia. 10 out of 10 stars.
By Peter S.
A trustworthy vendor, fast shipping, reliable payment methods, and high-quality products. There are many peptide compound companies out there to choose from with flashy sites and crazy branding - don't waste your time gambling! Sigma is a legit supplier, and a reliable compound manufacture with consistent adn potent peptides.
By Jim H.