Delivered as promised
AS most are, I was hesitant to give them a shot, but boy, did Sigma deliver- shipping is lightning fast, and the products are high quality. Will be ordering from again
By Scott F.
Monday, November 2, 2026 · Customer reviews of US businesses

The Fair Hearing score
Excellent
120 reviews
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Honesty, pricing, process and quality scores appear once 5 customers have rated them.
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
AS most are, I was hesitant to give them a shot, but boy, did Sigma deliver- shipping is lightning fast, and the products are high quality. Will be ordering from again
By Scott F.
Excellent products and packaging. Customer service answers all questions promptly. Delivery is very quick also. I'm a customer for life. Larry C
By Larry C.
Product selection is top notch. Website is made super user friendly and easy to navigate. Prices area little on the higher side but research products are excellent. Online ordering is great, fast processing. Deliveries on time. Definitely a must on your favs list!
By Raul M.
The oxytocin nasal spray was great and the vile quality was top. i don't need to worry about it breaking or losing quality, I need to buy more products before giving 5 stars but so far it's looking like my go to company
By Adolfo L.
Bought the peptide made easy book and love it! Full of helpful information and easy to navigate, Scott
By Scott
I have used Sigma compounds for their DSIP. The shopping experience was very easy, the shipping was fast, and the packaging was very professional. I would this company to any one looking for quality peptides they can trust
By zachary S.
Quality was great. Excited to see my results.
By Kirsten W.
Very fast shipping and quick communication when I had a simple question.
By Ray