Client + Student Transformations

When I first met with Katie, I had severe acne problems and was deeply discouraged about my health. Katie walked me through the step by step approach towards much clearer skin, encouraging me with her own story and making complicated information clear and accessible. She also personally taught me so much about my overall health. I now have a deeper understanding of my body and what it needs. I really appreciate her holistic healing method, bigger picture mentality and personal relationship with me. Thank you so much, Katie!

Katie's expertise, dedication, and support have been transformative for my health journey. Over the past five months of working with her, I have experienced incredible improvements in my overall well-being. When we began, I was dealing with severe eczema on both hands, persistent acne that had troubled me for most of my life, and chronic digestive issues that had plagued me throughout my adulthood. Katie's holistic approach involved identifying the right skincare products, supplements, diet and lifestyle changes tailored specifically to my needs. Thanks to her guidance, my hand eczema has completely cleared up, my digestion is now the best it has been in over a decade, and my facial acne is gradually improving!!! Beyond this, Katie supported me with a recent diagnosis I received. She truly knows how to educate, motivate and inspire, making the long and sometimes difficult process feel achievable. Even though I am based in Europe and not in North America, she made sure to help me find products that were accessible to me. I am genuinely grateful to have found Katie. Working with her has changed my life in a way that no other treatments, therapies, or nutritionists have managed before. After countless attempts and years of searching for solutions, I finally saw real results within just a few months under her guidance. I am truly grateful and highly recommend working with Katie to anyone looking to transform their skin or improve their overall health!!!

I worked with Katie for 4 months and learned so much about proper supplementation, eating appropriately for chronic acne, acne-safe skincare and makeup, and much more. She was always very responsive and got new protocols out in a very timely manner. I have seen great improvements in my skin in these 4 months and I will be continuing a more long term protocol she created for me until my next check in. I cannot recommend Katie enough - if you've been looking for a more sustainable way to manage acne and your overall health, this is the right investment. Thank you Katie!

Katie is an incredible nutritionist who brings both clarity and personalization to her work. She takes what can feel like a confusing mix of information—things like gut health, inflammation, and metabolism—and makes it understandable and actionable.

I especially appreciated how she used tools like the HTMA and gut testing to create an individualized plan. Her guidance is practical, easy to integrate into everyday life, and rooted in a genuine commitment and kindness :) If you’re looking for someone who can help you connect the dots and create a clear, sustainable plan for your nutrition and overall vitality, I can’t recommend her highly enough!

These services have changed my life for the better! I have worked with Katie for the past few months and have seen real results that make me stronger everyday. after struggling for 10 years with major hormonal issues, i finally have answers and protocols that the doctors never gave me. Katie is so patient, kind, and attentive and wants her clients to feel as great as they can so she is very dedicated to your journey. 1000% recommend to anyone who is ready to take back their health and regulate their hormones.

I started working with Katie in September 2024, and in such a short time, she completely changed my life. I’ve struggled with acne—painful, inflamed skin and constant breakouts on my face and back—for years. Since I was 17, I can’t remember a single day where I didn’t have at least one active pimple. I tried everything—lasering, facials, every skincare product you can imagine. I even went down the dermatologist route, taking medications without fully understanding what I was putting into my body. Nothing worked.

On top of the acne, I was also dealing with stomach bloating, constant pain, and a range of other symptoms that left me feeling uncomfortable and hopeless every single day.

Then I came across Katie. I decided to take a leap—and thank God I did. In just three months, my entire world shifted. Katie’s dedication, knowledge, and unwavering support made me feel truly seen and heard. She was always there for me, answering questions day or night, and for the first time, I actually began to fall in love with the healing journey instead of dreading it—something I had never thought possible before.

Thanks to Katie, my confidence is back. My skin is clear, my energy is better, and my lifestyle has completely transformed. I’ve adopted so many of the tools and habits she taught me that support my well-being on every level. Working with Katie was one of the best decisions I’ve ever made!!!

I’ve been working with Katie for a few months now. She’s SO knowledgeable, kind, and fun to work with. After my first appointment with her, she dug right in to sending over SO MUCH helpful, detailed information to get started. I began following her protocols and purchased the HTMA & DUTCH tests. Within 2 months of starting the beginning protocol, my body acne is nearly clear. Only a few small blemishes here and there. I just completed my testing and am waiting for results, to begin a more specified protocol, based on my results.
I’m so happy with my progress and working with Katie only a few months in. I also love how affordable the products she’s recommends. I’ve been to so many other specialists/docs who have made my past protocols nearly unattainable, due to costs.
I would highly recommend working with Katie!

Katie is an amazing practitioner to work with and have under your belt along your healing journey. In just a few short months I've noticed a huge improvement in my skin and am finally so relieved to not rely on harsh skincare to keep my acne at bay. She is always very attentive and a huge support when anything goes haywire. I love how we reach to the root cause together and the protocols she puts together are very specific FOR YOU. Very happy I found her!

Katie is simply put: amazing!  I have been working with her the past couple of months and my metabolism has seen such an improvement.  She has helped pair me with proper nutrition and supplements for my body/needs.  My bloating is far less/if any some days which has been an issue for about a decade now.  She is super kind and willing to help whenever I reach out on the portal!  It’s not a consultation and move on mentality - I know I can reach out anytime and she will brainstorm solutions with me!  I strongly recommend working with her!

Katie has been beyond helpful & knowledgeable. I was worried to invest in myself as I thought I could figure out my acne on my own and fix it for good without help. However, when I came across Katie’s page, I started to realize that maybe I don’t know as much as I thought I did. I took the leap to begin seeing her and I have 0 regrets. After a few months my skin has significantly cleared up and I, in general, just feel better. I’ve struggled with acne for 6 years, so to see this much improvement has been amazing and just a dream come true. If you’re also struggling, I highly recommend taking the leap and investing in your skin with Katie, you wont regret it.

I started working with Katie when I purchased the 3 tests to get some much needed answers for ongoing issues I have been having. She was a breath of fresh air after begging doctors for years to help me get some answers. She was thorough, explained all my results and set me up with a protocol I am excited to jump into. I finally feel like I have some answers and a plan to find some healing. I look forward to continuing to work with Katie as well during this process. If you are on the fence about taking the steps to find answers, you won’t regret choosing Katie!

Katie is an incredibly knowledgeable nutritionist and has helped me completely change my outlook on food and what “eating healthy” actually means. I’ve taken away so many important points in regards to a proper diet, and this has significantly changed my relationship with food. If you’re looking for help with anything digestion-related and especially for a long-term solution to better skin, Katie is your go to! Highly recommend!

Katie is by far the best nutritionist I have ever worked with and I can honestly say I’ve worked with many of them. We are working towards healing years and years of gut distress and I feel heard, and reassured working with her. Katie is always there to respond to any inquiries and gives me time to really hear my journey. I am beyond looking forward to experiencing as much relief as I have experienced thus far. If I could give her six stars I would. 100% recommend if you’re looking to heal.

Katie helped so much with my acne and dermatitis! I worked with her for 4 months, she ran hair testing on me and got to the root cause. I no longer have any issues. Thank you Katie.

Katie is the most passionate practitioner out there. Not only is she incredibly supportive, but she lives and breathes what she practices. Since the beginning of my gut healing journey, she has been there for any questions I have and has guided me through the whole ROUGHEST times. Katie is incredibly knowledgeable and seeks sustainable healing for all her clients.

Working with Katie and Alex both, have been beyond helpful for my healing journey! Although I am a complex case of multiple things going on at once, they helped me tackle things within my ability and head on at the same time, not overwhelming me but coming alongside me. My energy levels, anxiety, and bloating has greatly improved, and my acne continues to make strides toward the me that I once knew. I even had a new diagnosis more recently, and both Alex and Katie immediately made case specific recommendations that have helped me so much in the past few months. Attentive, professional yet so relatable as well, and prompt in responding to any and all questions. They provide amazing guidance and recommendations! So grateful for their help in getting my foundations in check and setting me back on a path of healing. Love them

I'm just about a month into working with Katie and she's extremely knowledgeable and passionate about what she does. I already have less stomach pains/heartburn/ reflux, better sleep, better digestion and am noticing skin improvements. I would definitely recommend her to anyone looking to make diet and lifestyle changes to truly transform their health for the better!

If you’re looking for a support, a friend, someone that listen to you and try all her best to help you out then you should look for Katie!!! I have tears in my eyes when I remember how sick I was when I started my journey with her and how I feel now, my anxiety and depression are almost gone, my gut is much better and I can eat almost everything, I’m able to workout again and so much more things that got me to trust my body again and be able to heal from all my health issues. It’s been already a year together with Katie and she will remain my forever support!

I recently did an HTMA test and met with Katie because I have been struggling with fatigue, acne, blood sugar issues,  and PMS symptoms.  I am a Nutritional Therapy Practitioner and I have a good understanding of foundational health and how to support my body, but it was time to get a deeper look at what is happening on the inside. After meeting with Katie I felt like I got some answers to why I am struggling with these symptoms and she explained everything so well. I learned a lot just from our meeting because she went into detail on every single mineral and how it relates to other minerals and ways to support them. She also sent me a detailed outline of our session notes and a protocol. I loved that her recommendations were food, lifestyle, and supplements. I definitely plan on working with her again in the future and recommend working with her if you are looking for 1:1 support!

I usually never write reviews, but I've gotta let people know how satisfied I am with my experience working with Katie!
I had the opportunity to work with her this year and was incredibly impressed with her services. First I met with her for a complimentary diagnostic call, in which she really helped me understand my options and the exact prices that each route would cost me, which I so appreciated.

We decided on some functional diagnostic testing for me including a GI Map, the DUTCH hormone panel, and an HTMA test. Once my results were in she spent over two solid hours with me over Zoom to explain my results and talk with me about the personalized protocol she put together for my healing journey. Not only was she super thorough on our zoom call, she also put together an amazing, clear, and comprehensive written protocol for me to refer back to at any point. She went above and beyond. It's clear to me that Katie really knows her stuff and truly wants to help people get and stay well. Her own personal story of overcoming health challenges and healing is what made her stand out to me among the many practitioners to choose from, and I'm really so glad I went with her.

It's only been a couple months since first testing and implementing her protocol for me but I'm already noticing real, sustained changes. The suggestions she gave me were practical and easy to implement. She also provided links (with discount codes!) to her online storefront for the suggested supplements she named for me- this made the process of getting things going so simple and easeful. I'm so glad I decided to seek out Katie and hire her for her top tier knowledge and custom tailored support. It was absolutely money well spent.

I love Katie's approach to hormone health and skin health. As someone who has already established a lot of the foundational things, I still found her recommendations very helpful for digging deeper into my lingering hormone issues and working towards healing the root cause!

Katie and Alex completely saved me when my skin was at its worst. I struggled with cystic acne along my cheeks and jaw and just knew that I needed a long term solution. Accutane and other medications really didn’t appeal to me, especially as a child bearing age woman, so when I found Holistico, it felt like such a good fit. I’ve recommended them to friends and family knowing that they can help people in so many more ways than one. What they teach is so valuable and actually works.

Katie McKersie of Holistico has been so helpful for me. After I went off the pill after being on birth control for 8 years, it was a scary thing to navigate. Katie and her programs have helped provide direction regarding my hormone imbalances that came from birth control. I can say with confidence that the Holistico program will greatly improve your life and get you back on track. I am able to let my body do its work without any interference from the doctors that did not take the time and care to understand my needs and body functionality goals. I have recommended Katie to every member of my family! Thank you Holistico for changing my life!

Katie is very knowledgeable and I loved working with her. She’s been helping me this entire year. After working with her for 3 months my fungal acne completely cleared and my Eczema just about completely cleared up. The reason it didn’t completely is because of my constant picking. It’s amazing what supporting your body can really accomplish if you just give it the right tools.🥰

Although I have not worked directly with Katie, I have learned SO much through her social media platforms. Katie’s wide range of knowledge in the health space and informational content has allowed me to piece together missing links in my own health journey. I literally learn something new every time Katie shares new content. Following along has allowed me to gain hope again (not just skin related but health as a whole), and I would love to work with Katie in the near future! I love that her approach is to get to the “root cause” and that everything in the body works together (not just addressing a single component) – something that we all need reminding of. Thanks so much for all of the free content you provide to your followers, Katie! You are helping so many women out there to piece those “missing links” together and feel confident again. 😊

I was diagnosed with PCOS 5 years ago and was put on birth control and metformin. When coming off the pill all my symptoms returned such as acne, hair loss, weight gain, hirsutism and irregular periods. Katie helped me through my journey of coming off the pill and balancing my hormones which resulted in so much more than just the reduction of symptoms. I now feel less anxious and my mood and energy levels have increased significantly. I feel more confident in myself thanks to Katie’s help and her knowledge, it so much easier for me to stick with my decision of stopping birth control after 5 years and fixing the root cause of my PCOS while reversing symptoms. I was always told my doctors that the only thing that will help with my PCOS is birth control and I am now so happy to have found someone who actually listened to my concerns and addressed them.

Katie’s educational content has opened my eyes to how much our skin is impacted by our internal health. She has inspired me to start tackling my skin issues at the root cause rather simply treating the symptoms.

Katie is incredibly knowledgeable on a variety of topics from acne solutions to gut health to hormonal cycles. I have been helped by her E book on SIBO, which most medical practitioners know nothing about, and a ton of her free information she provides online. She has so much practical knowledge and support to help figure out the root cause of health issues, not just a bandaid approach to symptoms.

Katie has been a tremendous help to our family with regards to our nutritional health and overall well-being.  She has been there for us every step of the way providing guidance, knowledge and assistance especially throughout difficult times in our day to day life.  We are extremely grateful to Katie for everything she has done for us and look forward to working with her again in the near future.

Thank you Katie!!!

The experience I had with Katie was perfect. She is so caring and generous with her time, i felt very confident working with her. We did functional testing and i loved the way she helped me actually understand my test results by explaining every marker and solution for each. I would work again with her any time!

I highly recommend Katie’s acne solution program! It helped me learn so much about my body and what ingredients to look for in food! It is truly amazing and has lessened my acne so much! I am still learning and would trust anything she has to say.

I attended Katie’s Master Class and WOW!! It was so good!! So informative and helpful. This is exactly what we need when deciding who to work with. She shared so much of what she will be offering in her program. Get to the “root root cause”. Amazing!!

I recently followed Katie through social media and I LOVE her content and all the knowledge she has to offer. I struggle with acne and I hope to do her program one day! Totally worth it!

katie + alex are the best! It is truly a gift to be doing this work with them. I've been dealing with some major gut stuff post birth control and they are helping me get to the root of it + heal it naturally which is what i've been trying to do for for the past 3 years. I've been to multiple mds. dermatologists, gynos, tcm practitioners, functional drs, naturopaths and ayurvedic practitioners and no one I have ever worked with was able to give me the answers I needed until now. the time, commitment and support that katie + alex both put into this work is beyond. they really care and hold your hand through the entire process which is incredibly rare. dream team. bless ❤️

Two amazing girls! Alexandria is completely fantastic, listening and understanding. The two of them have a lot of knowledge about the body and various needs and I am SO happy to have chosen them. I started because of bad psoriasis, frequent migraines and cramps during menstruation. it has made a big difference in my hormones, bloating and migraines. it has truly been an investment in my health. I got a lot of material to work on and will definitely come back if I ever need it. You can really feel the compassion from Alex, she is such a wonderful person! Can only recommend it to others!

Katie and Alexandria are great! I found out about Holistico when I had my skin at it's lowest point, and they have helped me in so many different ways. My skin is doing much better, and I don't think I would've made so many significant life changes had I not found them

Before meeting Katie I was constantly bloated, scared of my celiac disease, scared of food and feeling pretty hopeless. Some days I would eat nothing while others I would have bizarre cravings and binge eat ice cream at 12 AM.

Now I feel balanced. I actually have a metabolism. My cravings have completely disappeared. My bloating has improved tremendously. Most importantly- I feel more myself and happier!

Also- for the first time in (quite possibly my entire life) I am having regular bowel movements!! I had tried everything- water, loads of fiber, prescription laxatives- nothing worked. Now, after only following my protocol for 2 months I have gone 2 weeks with no constipation.

I recommend her to everyone and now my cousin is working with her as well!

I have been to so many nutritionists and Katie is my all time favourite!!! She is just as invested in your journey as you are and goes above and beyond what you would normally expect! I could not recommend her more!

Katie is so passionate about her work and went above and beyond to help me with all of my issues. I am so grateful to have found her company. I had been struggling with heart burn and muscle pain for so long and nothing was working but Holistico was able to provide me with all the advice/resources/help I need! You cannot go wrong with this place.

Katie provides such a wonderful, holistic service! Katie is super knowledgeable and supportive! Not only gives you the knowledge but fully supports your journey along the way.

watched the masterclass, it was very affirming to hear that i’m not the only one, who gets hormones or blood tested and gets “your results are normal” result, but then all the doctors are saying “your acne is hormonal”. and you get all confused! got really interested in the functional tests, thinking of purchasing them

I would highly recommend Katie & Holistico to anyone looking to better understand their hormones to help heal their acne! She is so knowledgable & makes the information very approachable.

Kate is a not just a great coach, she’s a good friend. She’s someone you feel comfortable relying on. I appreciate her in every way.

Katie is so knowledgeable at what she does and shares such helpful tips and information. Thank you Katie!