Prolon is a science-driven nutrition brand focused on supporting healthy aging and longevity through evidence-based nutritional programs. Its flagship product, the Prolon 5-Day Diet, is a patented Fasting Mimicking Diet (FMD) developed from more than 25 years of research and 40+ published clinical studies conducted in collaboration with USC, Mayo Clinic, and Stanford, to help the body enter a fasting-like state while still providing carefully formulated nourishment that supports natural cellular renewal. The 5-Day Diet is a complete, pre-packaged nutrition program that includes portioned meals, snacks, and beverages for each day, making the experience simple to follow without calorie counting or meal planning. Clinical research published in peer-reviewed journals, including Nature Communications, found that participants completing three consecutive monthly cycles experienced an average 2.5-year reduction in biological age markers, while also supporting healthy metabolism, preserving lean muscle, and promoting fat loss. But the 5-Day Diet is only the beginning. The same decades of longevity research that gave rise to the FMD also informed Prolon's broader ecosystem of science-backed products designed for everyday life. This includes L-Biome, a precision probiotic formulated to support gut health and metabolic function; fast bars, developed to extend the fasting state between meals; nutrition shakes built around longevity-supporting protein ratios; and guided reset programs that combine multiple Prolon products into structured, longer-term health protocols. Every product in the Prolon line shares the same origin, rigorous peer-reviewed science, and the same goal: to give your body what it needs to function better for longer. Founded on the belief that nutrition should be grounded in rigorous scientific research rather than trends, Prolon develops all of its products using a research-first approach. Prolon is part of L-Nutra, a nutrition technology company dedicated to advancing evidence-based nutrition for healthy aging and longevity. Our mission is to make cutting-edge longevity science accessible to everyone because how you age is not simply something that happens to you. It is something you can actively shape.
Written by the business, not verified by us.Prolonlife (prolonlife.com) has a 4.2 out of 5 rating on OK.one, based on 201 user reviews collected here. It is listed under Beauty & Well-being and its reputation is good. 77% of reviews are 4 stars or higher and 8% are 1 star; The business has replied to 97% of negative reviews; Reviews mostly discuss Product, Quality, User experience. Last updated 2026-08-12.
Reviewers had a great experience with this company. Customers frequently highlight the exceptional quality and delicious taste of the products, noting that the structured daily routines make fasting surprisingly satisfying and easy to follow. Consumers consistently praise the professional guidance and responsive customer service representatives who quickly resolve questions and assist with purchases. However, some reviewers were not happy with ordering complications, mentioning unexpected subscription renewals and difficulties managing automated shipments. A few other people also felt that certain food flavors were unappealing or grainy, while others reported frustrating shipping delays. Some individuals additionally experienced missing components in their delivered kits or found specific snack items difficult to enjoy.
Auto-generated from all reviews of this business. For reference only.Hi Jennifer, Thank you so much for sharing your experience with us. We’re really glad to hear you found the 5-day program effective and that it’s been a positive part of your wellness routine. We truly appreciate your feedback and your support. If you ever have any questions or need anything along the way, don’t hesitate to reach out. We’re here for you.
excited to do it for the second time!
Hi Kayla, Thank you so much for sharing this with us. We’re really glad to hear you had a positive experience and that you’re excited to do another round, that enthusiasm is wonderful to see. We truly appreciate your support and trust. If you ever have any questions or need anything along the way, don’t hesitate to reach out—we’re here for you.
After 3 consecutive months doing the 5 day fast we now do it every 3-4 months. Feel so good after and love clean energy we get after the first couple days.
Hi Laura, Thank you so much for sharing your experience with us. We’re really glad to hear that after completing three consecutive months, you’ve found a rhythm that works well for you and continues to support how you feel. It’s great to know you’re experiencing that sense of clean energy and overall well-being as you move through the program. We truly appreciate your continued trust and support. If you ever have any questions or need anything along the way, don’t hesitate to reach out. We’re here for you.
The product has produced the results that were promised. Clearer thinking, more energy and we even lost some weight. With the lifestyle change that has occurred, we will certainly lose more. I am glad that our family doctor recommended it.
Hi Scott, Thank you so much for sharing your experience with us. We’re really glad to hear that you’ve noticed positive changes like clearer thinking, more energy, and weight loss, and that Prolon has been a meaningful part of your lifestyle shift. It’s also wonderful to know your family doctor recommended it, that kind of support can make a big difference. We truly appreciate your trust and feedback. If you ever have any questions or need anything along the way, don’t hesitate to reach out. We’re here for you.
Hi Lawrence, Thank you so much for sharing this with us. We’re really glad to hear the checkout process felt intuitive and easy, that smooth experience is exactly what we aim for from start to finish. We truly appreciate your feedback and your support. If you ever need anything or have any questions, don’t hesitate to reach out. We’re here for you.
Hi Anthony, Thank you so much for sharing this with us. We’re really glad to hear you found the ordering process easy and the website informative that clarity and ease of use is something we work hard to provide. We truly appreciate your feedback and your support. If you ever have any questions or need assistance, don’t hesitate to reach out. We’re here for you.
I’ll start by saying, I’ve done the reset twice before this! And obviously liked it as was planning to do the third reset. I ordered from Prolon.ca directly and paid full price, as I did before. Once box arrived, I was curious as the two different vitamins which were included in previous orders, were not there?!? I contacted customer service and they said, in very long winded message, they no longer provide! Ok?? I requested a refund as I felt, I ordered kit and parts were missing. After 11 emails back and forth, they asked me to “prove” where on the website, I seen that vitamins were included! By this time their tone was borderline hostile. I however, did take a screenshot of vitamins being included! I asked for the forth time for a full refund! No response and now my emails won’t go through to them. Extremely disappointed as I did like the reset in the past
Hi Tina, Thank you for taking the time to share your feedback, and we’re truly sorry to hear about your experience with your most recent order. We understand how disappointing it must have been to notice a difference in the kit compared to your previous resets, especially when you were planning to continue your Prolon journey. We also want to clarify that certain product components have been updated in Canada due to regulatory and formulation changes, which may differ from earlier kits. Our Customer Service team worked with you over multiple exchanges to review your concerns in detail. A member of our management team also followed up directly to ensure you received additional support and clarification. After reviewing your case, we were able to provide a full refund as a one-time exception, even though this is not our standard policy, in order to ensure a fair and supportive resolution. We always aim to assist our customers as thoroughly and respectfully as possible, and we’re sorry if that did not come through clearly during your experience. We remain committed to transparency, support, and continuous improvement based on all feedback we receive. If you would ever like to reconnect, we’re still here to help. You can feel free to contact us via Main Prolon Number +18889265370 or [email protected].
I am so happy I just finished Prolon..It was so great. I have a high appetite and always hungry and with Prolon I wa never hungry, and felt so clear and energetic and this is my 6th day .Today on my 6th day I woke up , I was not hungry really, ate only 1 fasting bar, then went out, ran errands, walked 1 hour and came home, did cleaning and I was not a bit hungry, I felt so energetic and decided to eat some salad at 6 pm..This is a great freedom, I felt like I am so powerful not having those cravings..All I want is to keep this state..thank you
Hi Airsibel, Thank you so much for sharing your experience with us. We’re truly happy to hear that your ProLon journey felt so positive and empowering, especially that sense of clarity, steady energy, and freedom from cravings. It’s wonderful that you were able to stay active, feel energized throughout your Day 6, and reconnect with your body’s signals in such a meaningful way. That feeling of control and balance is exactly what many people hope to build on beyond the program. We really appreciate your thoughtful feedback and are grateful to be part of your wellness journey. If you ever need support or have questions as you continue, don’t hesitate to reach out. We’re here for you.
Everything was prepared. Easy to pack for lunch. The bars and olives could be eaten on the run.
Hi Judy, We are happy to receive your feedback. We’re really glad to hear you found everything well-prepared and easy to take with you, especially the convenience of the bars and olives for on-the-go moments. Making the program simple and practical to fit into daily life is exactly what we aim for. We truly appreciate your feedback and your support. If you ever need anything or have questions, don’t hesitate to reach out—we’re here for you.
Please take me off the subscription. I didn’t approve this and will dispute it with my credit card company if you automatically send me another order. This is my second request.
Hi Carole, Thank you for reaching out, and we’re very sorry for the frustration this has caused. We completely understand your concern. We understand that it is easy to miss a subscription or overlook renewal details. We want to confirm that your subscription has been handled and no further orders will be processed. Our team has also taken care of your request to ensure this is fully resolved. We are happy to have been able to support you and provide the assistance you needed. If you need any further assistance, please don’t hesitate to contact us at [email protected]. We’re here to help.
Product good, I gave it 3 stars because the website sucks, pain to get on then once on, account setting does not give you the info you need same with subscriptions, sending me a subscription when it says I have non and not able to fix it or cancel it
Hi Stace, Thank you for taking the time to share your feedback with us. We’re very glad to hear you find the product good, but we’re truly sorry to hear about the frustration you experienced with the website and account management experience. We understand how upsetting it can be when subscription details are unclear or when it feels difficult to access or update your account settings. This is not the experience we want for our customers, and we sincerely appreciate you bringing these issues to our attention. Your feedback has been shared with our team as we continue working to improve both the website functionality and the overall user experience. We also want to reassure you that if there is any active subscription on your account that you would like to review, modify, or cancel, our Customer Service team is here to help and can take care of this for you directly to ensure it is fully resolved. You can reach us at: Main Prolon Number: +1 (888) 926-5370 or [email protected] We truly appreciate your support and patience, and we’re here to make sure your experience moving forward is as smooth as possible.
horrible you keep shipping things I didn't order and it has an address that is no longer mine because I moved to Europe
Hi Luciana, Thank you for reaching out, and we’re very sorry for the frustration this has caused. We want to clarify that we were not previously informed of a move or a request to cancel the subscription. In cases like this, shipments may continue according to the active subscription on file. We also send a confirmation email a few days before each order is processed so any changes or cancellations can be made in time. That said, we are happy that our team was able to resolve this for you and ensure the subscription has now been properly addressed. We truly appreciate you bringing this to our attention, and we’re sorry for the inconvenience this has caused due to the change of address. If you need any further assistance or would like us to review anything else related to your account, please don’t hesitate to reach out to us at [email protected] or call us at +1 (888) 926-5370. We’re here to help.
Nothing specific
Hi Rita, Thank you for taking the time to share your feedback with us. We truly value all feedback, as it helps us continue improving both our program and the support we provide to our customers. If there is anything in particular you would like us to address or if you have any questions about your experience, please don’t hesitate to reach out to us at [email protected]. We’re here to help.
Products are great but your customer service personnel is even better. Yessica was extremely helpful, responded to emails right away, was polite and knowledgeable. She went the extra mile!
Hi Ibis, Thank you so much for sharing this wonderful feedback. We’re truly glad to hear you’ve been enjoying the products, and even more so that your experience with our Customer Service team stood out in such a positive way. It’s great to know Yessica was able to support you promptly, professionally, and with the care you deserved, going the extra mile is exactly what we strive for. We’ll be sure to pass along your kind words to her, it will mean a lot. We really appreciate your support and trust. If you ever need anything else, don’t hesitate to reach out. We’re here for you.
The customer service was great! understood my dilemma and was able to assist me right away.
Hi Raysa, Thank you so much for sharing this with us. We’re really glad to hear our Customer Service team was able to understand your situation and help you right away, that’s exactly the experience we aim to provide. We truly appreciate your feedback and your trust in us. If you ever need anything in the future, don’t hesitate to reach out. We’re here for you.
They explain why this is good for you, offering research to back it up and how it is safe for most people. However, when ordering it’s not completely clear what the differences (items, choice of flavors and total cost) in the 5-day fasts are.
Hi Holmurk, Thank you for sharing your feedback with us. We’re very happy to hear that you appreciated the educational information and research behind the program, as our goal is always to help our customers feel informed, safe, and supported throughout their journey. At the same time, we completely understand how the ordering process and differences between the 5-day fasting options, including flavors, included items, and pricing, may have felt unclear or confusing. We truly appreciate you bringing this to our attention, as feedback like this helps us continue improving the customer experience and making our offerings easier to understand. Please know that our Customer Service team is always more than happy to support and guide you through the different program options to help you find the best fit for your goals and preferences. Our Customer Service Team has already reached out to you directly via email from [email protected] to help address and clarify your concerns and work with you toward a resolution. Your satisfaction is very important to us, and we are dedicated to making your experience as smooth and positive as possible. We look forward to your response and the opportunity to support you further.
I have used Prolon FMD twice now and loved it!! I can't wait to try the NexGen box!! I love the idea of the soup being pre-made and eating it hot or cold 😎 It will be so convenient for work 🙂 I am especially looking forward to this round. Just found out I am pre-diabetic, and I want to curb my cravings to sugar.
Hi Lori, Thank you so much for sharing this with us. We’re really glad to hear you’ve enjoyed your Prolon FMD experiences and that you’re excited to try the Next Gen box, it’s great to know the convenience of the ready-to-eat soups is going to fit well into your work routine. We also appreciate you sharing what you’re currently focusing on with your health. Many people choose to incorporate Prolon as part of a broader lifestyle approach, and it’s encouraging to hear you’re feeling motivated going into this next round. We’re grateful to have you with us and truly appreciate your trust and enthusiasm. If you ever have any questions or need support along the way, don’t hesitate to reach out. We’re here for you.
ProLon makes a fasting reset easy. The soups are tasty and satisfying. We were never hungry. This time I will allow myself a few ounces of coffee first thing in the morning to stave off caffeine withdrawal headaches.
Hi Anne, Thank you for sharing your experience with us. We’re so glad to hear that Prolon helped make your fasting reset feel manageable and satisfying, and that you found the soups enjoyable and not feeling hungry throughout the program. It’s also helpful to hear your personal insight about adjusting caffeine intake to support your transition, everyone’s experience can be a bit different, and feedback like this is really valuable. We truly appreciate you taking the time to share your thoughts, and we’re grateful to be part of your wellness journey. If you ever have any questions or need support, don’t hesitate to reach out. We’re here for you.
I love the one day version. I still wish you made the soups/kale crackers to purchase individually. There's some days I just need that for a quick lunch!
Hi Tara, Thank you so much for sharing this with us. We’re really happy to hear you love the One-Day Reset, it’s great to know it’s been a helpful option for you. We also truly appreciate your feedback about wanting the soups and kale crackers available as individual items for quick lunches. That’s really helpful insight and we’ll be sure to share it with our team as we continue thinking about how to make our products even more flexible and convenient. We’re grateful for your support and for taking the time to share your thoughts with us. If you ever have any other questions or ideas, don’t hesitate to reach out. We’re here for you.
Quick help with a question on my recent order. Have used Prolon several times and always have good service as well as good results.
Hi Bettie, Thank you so much for sharing this with us. We’re really glad to hear you’ve consistently had good experiences with Prolon, both in terms of service and results, it means a lot to have your continued trust. If anything, else comes up in the meantime, don’t hesitate to reach out. We’re here for you.
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