Friday, November 6, 2026 · Customer reviews of US businesses
The Fair Hearing score
Excellent
129 reviews
Fat ScientistSelect a line to read only those reviews.
Honesty, pricing, process and quality scores appear once 5 customers have rated them.
Fat Scientist is a free online resource built for people using GLP-1 medications like tirzepatide (Mounjaro, Zepbound) and semaglutide (Ozempic, Wegovy). We specialize in tools and educational content for users of compounded versions of these medications, which come in multi-dose vials and require precise dosage calculations. Our suite of calculators helps users convert prescribed milligram doses into exact syringe units based on their specific vial concentration, calculate split doses for improved tolerability, estimate medication costs, and plan their treatment timelines. Every calculator is free, requires no account, and works on any device. We built Fat Scientist because compounded GLP-1 medications present a unique challenge. Unlike brand-name auto-injectors with pre-measured doses, compounded vials require users to do math that directly impacts their safety. A wrong calculation means injecting too much or too little medication. We believe nobody should have to guess when it comes to their health, and the tools to get it right should be accessible to everyone. Beyond calculators, Fat Scientist provides guides on topics like reading vial labels, understanding concentration values, proper injection technique, and navigating the differences between brand-name and compounded medications. Our FAQ library addresses the most common questions we see in GLP-1 communities, written in plain language without medical jargon. Fat Scientist is operated by Productist LLC. We are not a pharmacy, we do not sell medications, and we are not a substitute for medical advice. Our mission is purely informational — giving GLP-1 users the tools and knowledge to use their medications safely and confidently. We are funded by voluntary donations from our users, not advertising or affiliate deals, so our recommendations are never influenced by commercial interests. Whether you are just starting your GLP-1 journey or adjusting an existing regimen, Fat Scientist is here to help you get the nu
Fat Scientist (fatscientist.com) has 129 customer reviews on The Fair Hearing, with an average rating of 5.0 out of 5.
129 approved reviews, newest moderated first
I am very careful about making sure I am taking the right dose I triple check before I draw up my dose, fat scientist has given me peace of mind. It's easy to use and understand and I love having all the calculators and information in one place. I highly recommend. Thank you!
By DeeDee W.
Response from Fat Scientist· Aug 3, 2026
Thanks DeeDee, glad to help!
If you haven’t been using this, you should be. I love a no nonsense site that teaches me things. So useful, easy to use for different use cases, and educational. Really appreciate having this as an aid during my weight loss journey!!
By Winnie
Response from Fat Scientist· Apr 18, 2026
Thanks Winnie, appreciate the kind words.
Offers several ways to understand reconstituting peptides in powder form.
By Nancy E.
The rating is really a 10+
By Stanley P.
Response from Fat Scientist· Apr 6, 2026
You, sir, deserve 10 stars! Thank you for your support.
Amazing app. So helpful with the confusing dose info on the Tirz bottle. Love the split dose function. Perfect. Thank you so much
By DEANNE C B.
Response from Fat Scientist· Mar 28, 2026
Thanks Deanne! So glad Fat Scientist could help clear up the confusing dose info -- and really pleased the split dose function has been useful for you!
I love this site. Varying units can give you the mg and vice versa. Simple to use once set up for your product. I keep coming back to this site when I vary dosages. Thank you Fat Scientist for providing this.
By Bonbon
Response from Fat Scientist· Mar 28, 2026
Thanks Bonbon! That's exactly what we're going for -- simplicity and accuracy, however you need to slice it. So glad to be a reliable part of your routine!
Easy to use. SUPER HELPFUL. An absolute life saver. If you are taking a glp1 this is a MUST USE TOOL to double check you are taking the correct dose. I just started a split dose, thankfully I use fatscientist.com and bam, math done for me!
By Stacy D.
Response from Fat Scientist· Mar 15, 2026
Thanks so much, Stacy! Glad to hear that Fat Scientist and the split dose calculator has been useful for you!
This site has been so helpful in my weight loss journey with my tirzepitide dose. I can easily calculate what dose to take based on the concentration of my meds. This website is the go to for myself and a lot of my friends who use weight loss or diabetes shots.
By Ellen M.
Response from Fat Scientist· Mar 15, 2026
Thanks Ellen! So pleased that Fat Scientist has been a useful tool for you, and appreciate the kind words.
