Science-backed skincare guides created by a chemical engineer.
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Anabel on May 6, 2026
5 out of 5 starsSo glad I found this. I’ve been studying formulation for a few years and I’ve spent a lot of money on courses that ended up being mostly fluff or just didn’t go deep enough. This bundle is different. It’s probably the most complete material I’ve bought so far. I love the scientific approach, it’s not just recipes, it actually explains the 'why' behind everything. It’s a lot of information to process, so I’m still going through it, but even the chapters I’ve finished have already helped me clarify things that other courses made confusing. Also, Ashley is great and actually replies to messages, which is rare to find. Definitely worth the investment if you’re serious about formulating <3
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Cansu on Apr 30, 2026
5 out of 5 starsHonestly better than I expected. It’s quite detailed but still easy to follow. I learned a lot.
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Geraldine on Apr 14, 2026
5 out of 5 starsThis is a useful book for understanding the chemical process behind making solid shampoo. I believe it is necessary to understand this aspect if one wishes to enter this field. However, the information is sometimes a bit repetitive. Overall, it is a useful compendium for reference.
ashley responded on Apr 14, 2026
Thank you so much for your thoughtful review, I really appreciate it. I’m glad you found the guide useful for understanding the chemistry behind solid shampoo formulation. Regarding your point on repetition, some key concepts are intentionally reinforced throughout the guide to help build a strong formulation foundation and ensure clarity when applying them in different contexts. Thank you again for your feedback, it truly means a lot.
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Selina on Mar 9, 2026
5 out of 5 starsWonderful resource...clearly. laid out easy to follow. Just what i needed and will return to it time and time again. Love formulas and excited to try out the eye oils..
ashley responded on Mar 9, 2026
Thank you so much, Selina! I'm really glad the guide was helpful and easy to follow. I’d love to hear how the eye oil formulas turn out for you.
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melina on Feb 22, 2026
5 out of 5 starsExcellent and very detailed I cannot wait to try these simulations. The book is well written!
ashley responded on Feb 23, 2026
Thank you so much. I am really glad you found it detailed and helpful. I would love to hear how your simulations turn out once you start testing. Wishing you great results in the lab!
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Etsy buyer on Jan 26, 2026
5 out of 5 starsI have been loving reading this. I am wanting to figure out a shampoo bar and this has been excellent to understanding what it should have. This has given me a great foundation. It is also easy to find different sections if you are wanting to pounce around to understand something better.
ashley responded on Jan 26, 2026
Thank you so much for sharing this. I am really happy to hear that the guide helped you build a clear foundation and find what you needed easily. That means a lot to me.
About SwonLab
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ashley
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Hi! I'm Ashley Denise – a chemical engineer and skincare formulation expert. I create science-backed DIY guides for beauty lovers and indie brands who want more than just pretty packaging. Let’s bring the science to your skincare.
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