I am frequently asked by customers if they can use our handcrafted soap bars for hair care. For most hair types, my answer is no. Let me explain...
Shampoo bars first came across my radar several years ago. I found it interesting that people would use a soap bar as shampoo. So, I began making them using a popular formula from the soapmaking blogs. I was disappointed that the “shampoo bar” began to dry out and damage my fine hair. I tried another formula using apple cider vinegar, this time with improvement in the dryness, but still, no cigar. Not having much luck, I put the idea of formulating shampoo bars on the shelf and went back to following the shampoo bar discussions in the background.
In the meantime, I had been studying formulation ebooks from Susan Barclay of swiftcraftymonkey.blog. I came across some interesting information that she had written discussing the importance of pH when it came to hair care products. Basically (pun intended for the science nerds), hair has an acidic pH and thrives with use of acidic products. The high pH of handmade soap (which is lovely for skin, not so much for hair) can strip the lipids or fats in hair and damage the cuticle. (Ah ha! This is why handmade soap “shampoo bars” did not work for my hair.) I also attended the Hand Crafted Soap and Cosmetic Guild’s 2019 conference and sat in on Keri Mixon’s presentation on the Objective Comparison of Shampoo Bars. Again, the importance of pH in shampoo bars was reiterated. I located articles in the International Journal of Trichology, (a branch of dermatology that studies the health of the hair and scalp, yes it’s a thing) that did not recommend the use of bar soaps for shampoo (Draelos, 2010) and that “alkaline pH may increase the negative electrical charge of the hair fiber surface and… may lead to cuticle damage and fiber breakage." We don’t want this, the cuticle protects the main body of the hair. Additionally, according to D’Souza & Rahthi (2015) shampoos must not have a pH higher than 5.5.
Now that I was geared up with this information, I was ready to reformulate my shampoo bars. As much as a love using 100% natural ingredients, for hair products this is a difficult task. The best comprise for me was to use plant derived synthetic ingredients. I am so happy that I did! I was able to formulate a shampoo bar that I can use without drying out my hair. And….. shampoo bars can last a long time, approximately 3 bottles worth of shampoo depending on your hair length and frequency of hair washing. In fact, the main reason I decided to revisit shampoo bars was after walking into my daughters’ bathroom and seeing the 4 large bottles of shampoo and conditioner - they like an assortment. It really hit home that making a small change could reduce plastic waste. Using concentrated, solid shampoo and conditioner bars eliminates those plastic bottles that comes with liquid shampoo.
Now, not everyone has the same hair type, that’s why there is a multitude of hair care products on the store shelves. And, there have been a handful of case studies that showed some hair types that did not have damage after using a high pH product. So, what may work for my hair might not work for yours. But, if you are passionate about low or zero waste products, shampoo bars may be for you.
Live at ease,
Barclay, S (2018). Adventures in cosmetic chemistry shampoo bars you will love: Creating pH balanced bars. https://www.swiftcraftymonkey.blog/product/shampoo-bars-you-will-love-creating-ph-balanced-bars/
Draelos ZD (2010). Essentials of hair care often neglected: Hair cleansing. Int J Trichol (2) 24-29.
D’Souza P & Rathi S, (2015). Shampoo and conditioners: What a dermatologist should know? Indian J Dermatol 60 (3) 28-254.
Gavazzoni Dias MR, de Almedia AM, Cecato P, Adriano AR, Pichler J. (2014). The shampoo pH can affect the hair: Myth or Reality? Int J Trichol 6 (3) 95-99.
Mixon, K (2019). Objective Comparison of Shampoo Bars. HSCG Annual Conference. Gaylord Texan Resort & Convention Center. Dallas Texas. May 2019. Lecture.
Jamie is a serendipitous soapmaker with a love for all things DIY, health, and wellness. She is an Advanced CP-HP Soapmaker with certification from the Handcrafted Soap & Cosmetic Guild. She holds a Diploma in Advanced Organic Cosmetic Science from Formula Botanica. Before starting Lathering Lotus, she worked as a Pediatric Nurse Practitioner, Registered Yoga Teacher, and Professional Yoga Therapist. She lives with her husband, two daughters and her labradoodle near Pittsburgh, Pennsylvania.