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Beauty & Well-being

Prolonlife

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201 reviews

4.2201 reviews
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About Prolonlife

Data updated
Website
prolonlife.com
Category
Beauty & Well-being
Location
United States
Status
Unclaimed
Last 12 months
201 reviews
Replies to negative
97% (31/32)
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About this business

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.

Is Prolonlife legit?

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.

What reviewers say

AI generated

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.

What people say

Grateful for the box fix

Grateful for the box fix. Just bummed I couldn’t start my fast due to missing box #1.

Reply from Prolonlife2026-05-13

Hi Cynthia, Thank you for sharing your feedback with us. We’re very glad to hear the box issue was resolved, but we’re truly sorry that the missing Box #1 prevented you from starting your fast as planned. We completely understand how disappointing that must have been. We appreciate your patience as our team worked to make this right, and we’re always here to support you if you need anything further or would like help getting started. Please don’t hesitate to reach out to us at [email protected]. We’re here for you.

I do not want this product

I do not want this product! What don’t you understand??? Stop sending me boxes and charging my card. I will have to report your company to a fraud bureau

Reply from Prolonlife2026-05-13

Hi Sherry, Thank you for providing your feedback and for allowing us to assist you. We completely understand that subscriptions can sometimes be forgotten or overlooked, and we understand how frustrating it can feel to receive a product or charge you were not expecting. We noticed that one of our Customer Service team members was able to diligently contact you and identify the reason behind the challenges you were experiencing. We’re happy to see that we were able to support you and provide a resolution in a timely manner. Please don’t hesitate to reach out if you ever have any further questions or concerns at [email protected]. We are always here to support you and ensure we continue improving your experience. Also, thank you for your trust in Prolon. We’re truly happy to be part of your wellness journey.

I’ve done 11 or 12 Prolon 5 day fasts…

I’ve done 11 or 12 Prolon 5 day fasts and my biological age is now 14 years younger (per Function Heath)!

Reply from Prolonlife2026-05-15

Hi Laura, That’s incredible to hear, thank you for sharing your experience with us. We’re so glad to know you’ve been consistently incorporating Prolon into your routine and that you’re seeing meaningful results reflected in your biological age through Function Health. It’s really rewarding to hear how you’ve stayed committed over time and made it part of your long-term wellness approach. We truly appreciate your continued trust and support, and we’re honored to be part of your health journey. If you ever have questions or want support along the way, don’t hesitate to reach out. We’re here for you.

I use the reset once per month to help…

I use the reset once per month to help manage my weight loss

Reply from Prolonlife2026-05-15

Hi Karen, Thank you so much for sharing that with us. We’re really glad to hear that you’ve found the Reset helpful as part of your monthly routine for supporting your weight management goals. It’s great to see you incorporating it consistently in a way that works for you, and we truly appreciate your continued trust and support. Please don’t hesitate to reach out if you ever need anything. We’re here for you.

I have been a customer of ProLon…

I have been a customer of ProLon products for quite some time and they are always amazing The products are top quality and you are never disappointed They are delivered on time as stated I will continue to use their products

Reply from Prolonlife2026-05-15

Hi Janice, Thank you so much for your kind feedback. We’re truly happy to hear that you’ve had a consistently positive experience with Prolon over time. It means a lot to know you find the products high quality, reliable, and delivered as expected. We really appreciate your continued trust and support. Please don’t hesitate to reach out if you ever need anything. We’re here for you.

I didn't order anything

Incredible service, quick response and a very client friendly resolution, was extremely impressed.

Reply from Prolonlife2026-05-15

Hi Alex, Thank you so much for your kind feedback. We’re really happy to hear that you experienced quick, supportive service and a resolution that felt smooth and client friendly. We appreciate you taking the time to share this, and we’re grateful for your support. Please don’t hesitate to reach out if you ever need anything. We’re here for you.

Started using FMD back in 2018

I started using FMD in 2018 when breast cancer was first found. I used for 6 consecutive months and I found it to be easy and I felt well. I used it every now and then, more to 'clean up my eating' which is easier to do after a 5 day FMD. Once I became metastatic (I'll always wonder if I kept with FMD if I could have avoided that 2nd diagnosis but life if full of 'woulda, coulda, shoulda' questions) I have found that side affects to the infusions are greatly decreased. Now, there are new flavors of soup which I love...and the 1 day fasts which I now do also. I love that I know that I am doing something good...not only for my body, but for my cells! And...it is easy, well researched and well supported with customer service people, texts, videos and FB.

Reply from Prolonlife2026-05-15

Hi Mary, Thank you so much for taking the time to share your experience with us. We’re truly honored to hear how you’ve incorporated the FMD into your routine over the years and that it has continued to feel supportive, easy to follow, and helpful as part of your wellness practices. It means a great deal to know you’ve also been enjoying the newer soup flavors and the 1-day fast options. We’re especially grateful for your kind words about the program being well-researched and supported. Our team is deeply committed to providing not only science-backed nutrition, but also ongoing education and support through multiple channels so you feel guided every step of the way. We appreciate you being part of the community and sharing your journey with us. Please don’t hesitate to reach out if you ever need anything. We’re always here for you.

The program was easy to follow and…

The program was easy to follow and complete. Most of the food was surprisingly tasty. I did not experience excessive hunger. I was, however, a disappointed in the results. I only lost 2 pounds and did not notice any discernable change in my energy.

Reply from Prolonlife2026-05-13

Hi Sally, Thank you for taking the time to share your experience. We’re very happy to hear that you found the program easy to follow and complete, that most of the foods were surprisingly tasty, and that you did not experience excessive hunger during your round. At the same time, we completely understand your disappointment regarding the results and not noticing the level of changes you were hoping for. Please know that our goal is always to ensure our customers feel supported and satisfied, and we are fully committed to finding the best possible resolution for you. I would really appreciate the opportunity to better understand the challenges you experienced with the program so that we can address them appropriately. Each person is unique, and weight loss between rounds may vary based on several factors, including stress levels, dietary practices before or after the round, hydration, sleep, activity levels, or even the timing of your cycle. We also often hear from individuals who do not notice weight loss or changes until well after their round is completed. It’s also important to note that the primary benefits of the 5-day Prolon fast are centered around cellular rejuvenation and metabolic support, while weight loss is considered a beneficial side effect. So even if you did not experience dramatic weight changes, your body may still have been receiving many of the fasting benefits. In clinical studies, participants who completed one 5-day ProLon cycle per month for three consecutive months experienced an average weight loss of approximately 5.7–6 pounds by the end of the study, primarily from abdominal fat while helping preserve lean body mass. Please feel free to reach out to us if you need any further support or if there is anything else we can do for you. You can contact us anytime at [email protected] or by phone at +1 (888) 926-5370. We are here for you and happy to support you throughout your journey.

Would have given a 5 star

Would have given a 5 star, but too expensive , and should have a better mix of soups.

Reply from Prolonlife2026-05-13

Hi Robbin, Thank you for sharing your feedback with us. We understand that our program can be a significant investment in your health, and we truly appreciate you taking the time to share your thoughts. We are committed to enhancing our offerings and making them as cost-effective as possible. We're dedicated to finding ways to ensure this product, based on 20+ years of scientific research, is as accessible as possible so more people can benefit from it. Please also keep an eye out for any promotions we may run in the future. We also understand your feedback regarding variety. While we always aim to improve taste and diversity, it’s important to note that the soups were specifically designed and carefully formulated to help mitigate the potential adverse effects of intermittent fasting. Our research showed that carefully controlling energy intake and macronutrient composition can extend physiological ketogenesis similar to a water fast, while still providing energy and nutrients to increase fullness and satiety. We truly appreciate your input and will continue working to improve both the experience and variety offered.

Your site sucks it took 9 tries before…

Your site sucks it took 9 tries before I could complete the order. No support or a number where I can call. I may just discontinue using this product due to lack of support.

Reply from Prolonlife2026-05-13

Hi Chandrajeet, We appreciate your feedback and truly apologize for the frustration you experienced while trying to complete your order. We understand how discouraging it can be to go through multiple attempts, and we will absolutely use your feedback in the best way possible to help improve and prevent these challenges from occurring in the future. We also wanted to highlight that if you scroll all the way to the bottom right of our website, you will find under "Get in touch" our email address and phone number, which are the best ways to contact us directly and receive immediate support. In any case, I also wanted to share the best ways to reach us directly: Main Prolon Number: +1 (888) 926-5370 also by email at: [email protected] We would be more than happy to support you, answer your questions, and help make your purchasing experience as smooth as possible moving forward. We hope this information is helpful, and please don’t hesitate to reach out if you ever face any additional challenges. We are here to support you.

Feel great!

A have arthritis in my knees and they feel amazing after doing the fast! I thought the food was yummy. Looking forward to doing the fast again!

Reply from Prolonlife2026-05-15

Hi Andrea, Thank you so much for sharing your experience with us. We’re really glad to hear you felt good during and after the fast, and that you enjoyed the food as well. It’s especially meaningful to hear that you’re feeling such a positive difference in your knees, that’s wonderful to know. 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.

Highly recommend

I just purchased my sixth box of the 5 day FMD. It has been life changing for me, I would highly recommend to anyone interested in improving their health and longevity. This program is a beginner friendly way to integrate a fasting lifestyle into your life.

Reply from Prolonlife2026-05-15

Hi Laurie, Thank you so much for sharing this with us. We’re truly glad to hear that Prolon has been such a meaningful part of your health journey and that you’ve continued with it over time. It’s wonderful to know you’ve found it accessible and supportive as you’ve integrated fasting into your lifestyle. We really appreciate your recommendation and your continued trust. If you ever have any questions or need anything along the way, don’t hesitate to reach out. We are here to support you.

Ordering was easy and my kit is almost…

Ordering was easy and my kit is almost ON THE WAY. The sooner it gets here the better! I can't wait! Thank you!!

Reply from Prolonlife2026-05-15

Hi Mary, Thank you so much for sharing this with us. We’re really glad to hear the ordering process was easy and that your kit is already on its way, that excitement is great to see! We truly appreciate your support and enthusiasm. If you ever have any questions or need anything along the way, don’t hesitate to reach out. We’re here for you.

I love your fasting bars

I love your fasting bars. When I do my intermittent fasting, they fill the void.

Reply from Prolonlife2026-05-15

Hi Pam, Thank you so much for sharing this with us. We’re really glad to hear you enjoy the fasting bars and that they’ve been helpful for you during your intermittent fasting routine. It’s great to know they help make things more manageable and satisfying for you. We truly appreciate your support. If you ever have any questions or need anything along the way, don’t hesitate to reach out. We’re grateful to be part of your wellness routine.

It was confusing with so many email…

It was confusing with so many email requests

Reply from Prolonlife2026-05-13

Hi Brian, We really appreciate you bringing this to our attention and are sorry to hear that the number of emails felt overwhelming. You can always unsubscribe from our email list by clicking “Unsubscribe” at the bottom of any email or reply STOP to opt out of text messages. Please keep in mind that unsubscribing may prevent you from receiving daily fasting tips, encouragement, coaching reminders, or important updates related to webinars and recordings during your program. Our goal is always to keep our customers educated, informed, and supported throughout their journey. If you would prefer assistance managing your communication preferences, please feel free to contact our Customer Service team at [email protected], and we would be happy to help.

Purchasing was easy

Reply from Prolonlife2026-05-15

Hi Nancy, Thank you so much for sharing this with us. We’re really glad to hear that the purchasing process was easy and smooth, that’s exactly the experience we aim to provide. We truly appreciate your feedback 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.

they were responsive to concern

I had dropped one of my soups and the assistant helped problem solve with me and sent a replacement

Reply from Prolonlife2026-05-15

Hi Deb, Thank you so much for sharing this with us. We’re really glad to hear our team was able to help you quickly and work with you to replace the soup, that’s exactly the kind of support we aim to provide when unexpected things happen. We truly appreciate your feedback and your trust in us. If you ever need anything else, don’t hesitate to reach out. We are always here to support you.

My Go-To for a Reset

I've done roughly 8 rounds over the past 6 years. It is the only fast I'll do. Easy to follow; but requires your commitment. Nut bars for breakfast, soups for lunch and dinner. Some snacks depending on the day. Sign up for the free coaching zoom calls on the week you plan to do the 5-day; they will walk you through preparing and the day you break the fast. Lots of helpful tips on the calls. If you are registered for that session, they will email you a link if you miss it live. There's 20 years of science behind it and it works. My RDN recommended I give it a try when I hit a plateau after losing the first 30 pounds. I still do this fast when I need a reset. Great customer service. Quick delivery. You can email them with questions. Lots of support. If you do any fast, do this one.

Reply from Prolonlife2026-05-15

Hi Paula, Thank you so much for taking the time to share such a thoughtful and detailed review. We’re truly glad to hear that Prolon has been a consistent part of your routine over the years and that you’ve found the program easy to follow, well-supported, and effective as a reset when you need it. It’s especially great to hear that the coaching calls, resources, and customer support have been helpful along the way. We really appreciate your trust and long-term commitment, 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.

Worst customer service ever

Reply from Prolonlife2026-05-13

Hi Robin, Thank you for sharing your feedback. We’re very sorry to hear that your experience did not meet your expectations. We take all customer concerns seriously and made multiple attempts to reach out through our support channels to better understand the issue and offer assistance. In addition, a member of our management team also reached out directly in an effort to help resolve the situation. Unfortunately, we did not receive a response to our outreach. We always aim to support our customers and provide timely resolutions whenever concerns arise, and we remain open to assisting you further if you would like to reconnect with us. Please feel free to contact us at [email protected] or Main Prolon Number +18889265370 so, we can help address any outstanding concerns. We look forward to supporting you, and make this experience a better one for you.

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