The zoom calls with Cynthia Sass were very helpful, offered great tips, and made following the plan easy. It helped me keep focus daily on why I was doing this and gave me the motivation to continue.... Toon meer
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This company is top notch. Everything from their products, to the research that backs them. Their support through the fasting experience, as well as additional product solutions outside of your main... Toon meer
They sneakily signed me into subscription -I tried to cancel and they said order. Sent already even tho I sent email minutes after. Then when I emailed again response was from different co referring m... Toon meer
Bedrijf heeft geantwoord
I love the Prolon FMD programs, products, and customer service! All three are stellar and I have no doubt Prolon is helping me achieve the best health possible. Getting the benefits of fasting while e... Toon meer
Bedrijfsgegevens
Geschreven door het bedrijf
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.
Contactgegevens
Verenigde Staten
- prolonlife.com
4,1
Goed
10K reviews
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Antwoord van Prolonlife
Hi Kristine,
Thank you so much for sharing your experience, Kristine!
We’re so glad to hear you felt energized and comfortable throughout most of your five-day fast.
Wishing you continued success on your Prolon journey!
An update to my 08/31/2026 one star review
I had written a one star review August 31, 2026 regarding ordering challenges. Prolon definitely reads these reviews. I was contacted immediately by Jennifer at Prolon. She was extremely pleasant and understanding and willing to look into the Link challenges. She offered me a 20% discount on a future order. And because of the cart problems I had with my first order, some of the items I ordered were not delivered. I again contacted Jennifer and the missed items were delivered yesterday. Excellent customer service. My husband did the five day fast (Gen 3, Bold flavors) and lost 15 1/2 pounds. The soup was easy to prepare and best done on the stove. He did not cheat even though mentally he wanted to, but said he really wasn't hungry. All the items in the kit were tasty except he wasn't a fan of the hibiscus tea, but still drank it. He did the transition diet on day six and seven and had no digestive problems. He did make sure he stayed hydrated. He said he felt weak on Day 3, but worked through it. He is traveling now and eating sensibly with food I packed for him and using the Intermittent Fasting Bars when needed so as not to eat at restaurants. He will be doing another five day program in a month. We totally recommend this company, its customer service and its product. Thank you!
12 september 2026
Review zonder uitnodiging
Antwoord van Prolonlife
Hi Suzanne, thank you so much for taking the time to update your review and share such a thoughtful account of your experience!
We are so honored to have you as part of our community.
It was truly a pleasure working with you, and I’m so glad we were able to help resolve the ordering issues and get the missing items to you.
We’re also excited to hear that your husband had such a positive experience with his five-day fast and that he’s already planning another round.
Thank you both for trusting Prolon and for being such a wonderful part of our community. We truly appreciate your kind words about our team and product!
I haven’t gotten the current kit but on…
I haven’t gotten the current kit but in the past the process has been easy, the support good and results amazing - clear headed, lighter, more energy
14 september 2026
Antwoord van Prolonlife
Hi Barbara,
Thank you so much for sharing your experience, Barbara!
We’re happy to hear that you’ve had such positive experiences with Prolon in the past, from the ordering process and support to how you’ve felt during your fasts.
We hope you have another great experience with your upcoming kit and wish you continued success on your longevity journey!
Please, don't hesitate to reach out if you ever need any support, you can contact us at customerservice@l-nutra.com. We are always happy to support you.
I haven't even received the product yet…
I haven't even received the product yet and you are pestering me for reviews. PLEASE STOP IT.
14 september 2026
Antwoord van Prolonlife
Hi Valerie,
Thank you for taking the time to share your experience. We truly value your feedback and are committed to ensuring you have the best possible experience with Prolon.
We’re sorry to hear that you’re feeling overwhelmed by the emails, and we appreciate your feedback.
The reason we send them is to provide helpful information, tips, and guidance so you can get the most out of your experience with Prolon, especially before and during your fast. Our goal is always to ensure you feel supported and informed.
That said, we completely understand the importance of choice. Every email we send includes an easy option to unsubscribe if you’d prefer to no longer receive these messages. We respect your preferences and want to make sure you feel in control of the information you receive.
Our Customer Service Team has already reached out to you directly via email from customerservice@l-nutra.com 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 choose my product Order they ship est…
I choose my product Order they ship est pest experience
11 september 2026
Antwoord van Prolonlife
Hi Kim,
Thank you for sharing your feedback! We’re so glad to hear you had a positive experience with your Prolon order.
We truly appreciate you choosing Prolon and hope you enjoy your products!
I had difficulty ordering the 5 day…
I had difficulty ordering the 5 day Fasting because the buy button was barely visible at the bottom of my screen so I was unable to click buy. I had to use a PC to purchase.
9 september 2026
Antwoord van Prolonlife
Hi Kathy,
Thank you for taking the time to share your experience. We truly value your feedback, and we’re sorry to hear you had difficulty completing your order and needed to switch to a PC to make your purchase.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com so we can better understand what happened and share your feedback with the appropriate team.
We appreciate you bringing this to our attention and giving us the opportunity to look into it. We hope to make your experience with Prolon as smooth as possible moving forward.
I got signed up of a subscription w/o…
I got signed up of a subscription w/o my knowledge despite being vigilant against. Did not receive notice of subsequent billing until it was too late to cancel.
Very deceptive marketing practices.
10 september 2026
Antwoord van Prolonlife
Hi Geoff, thank you for taking the time to share your experience, Geoff.
We’re sorry to hear about the frustration and concern you experienced regarding your subscription and billing.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com, and we were able to speak with you personally to review your concerns and work toward a resolution.
We truly value your feedback and appreciate the opportunity to address your concerns directly. We hope our conversation and the resolution provided have helped make this experience a better one for you.
I have been on a health journey and…
I have been on a health journey and Prolon was a big contributor to my success! Was diagnosed with multiple autoimmune diseases about 10 years ago and I now have all normal markers and feel really good!
9 september 2026
Antwoord van Prolonlife
Hi Lauren, thank you so much for sharing your experience.
We’re honored to have been part of your health journey and so glad to hear that you’re feeling good and seeing positive changes in your overall well-being.
We truly appreciate you taking the time to share your experience with us.
Wishing you continued success on your journey and thank you for being part of the Prolon community!
Cancelling subscription
I find it hard to cancel the subscription for this product. I enjoyed it however I am not able to afford anymore, I thought I cancelled the subscription early August, but to my surprise I was still charged and now a package is being mailed to me. Is it possible to return the product and get a refund.
8 september 2026
Antwoord van Prolonlife
Hi Jacqueline,
Thank you for taking the time to share your experience. We truly value your feedback, and we sincerely apologize for the frustration you experienced regarding your subscription and unexpected charge.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com to better understand what happened, address your concerns, and work with you toward a resolution.
Your feedback is very important to us, and we appreciate the opportunity to look into this personally. We hope to make this experience a better one for you.
Great product and the results are…
Great product and the results are amazing. Great way to springboard you into a lifestyle change. Customer service was amazing
30 november 2025
Antwoord van Prolonlife
Hi John,
Thank you so much for your wonderful feedback! We’re excited to hear that you’ve had such a positive experience with Prolon and that it has helped you take steps toward meaningful lifestyle changes.
And we’re especially happy to hear that our Customer Service Team was able to provide you with great support.
We truly appreciate you being part of the Prolon community and wish you continued success on your health and longevity journey!
You charge me for an order that was…
You charge me for an order that was never processed, and took a month to finally credit me for the unfulfilled order. That is not good or ethical practice!
9 september 2026
Antwoord van Prolonlife
Hi Sharon,
Thank you for taking the time to share your experience. We truly value your feedback, and we sincerely apologize for the frustration caused by the unfulfilled order and the time it took for the credit to be issued.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com so we can look into what happened and better understand your concerns.
We appreciate you bringing this to our attention and giving us the opportunity to review the situation. We hope to have the chance to address your concerns and provide a better experience moving forward.
Have a problem with the website
Have a problem with the website. I looked at the website, put things in the cart, but never completed the purchasing process.
And then 2 days later I get an email that suddenly the sale has gone through
I don’t feel I completed the purchase and of course there was no way to stop the transit.
At this point, I don’t know if I want to use prolon. There is something fishy about this website.
9 september 2026
Antwoord van Prolonlife
Hi Miss Beuttas,
Thank you for taking the time to share your experience. We truly value your feedback and are sorry for the inconvenience and frustration you experienced.
Our Customer Service Team has reached out to you directly from customerservice@l-nutra.com to better understand your concerns, provide clarification, and support you with a resolution.
We’re glad we were able to connect with you directly and work toward a resolution. Your experience matters to us, and we’re committed to making sure our customers feel heard and supported.
We appreciate the opportunity to assist you and hope to continue supporting you moving forward.
Trying to cancel subscription
Trying to cancel subscription, and returning an order has been a nightmare - so difficult to do. I need a label to return an order, that I asked for before it even arrived, and I still don't have one.
3 september 2026
Antwoord van Prolonlife
Hi Rochelle,
Thank you for taking the time to share your experience. We truly value your feedback and are sorry for the inconvenience and frustration you experienced with the cancellation and return process.
Our Customer Service Team has reached out to you directly from customerservice@l-nutra.com to better understand your concerns, provide clarification, and work with you toward a resolution.
We’re glad we’ve had the opportunity to connect with you directly and work toward addressing your concerns. Your experience matters to us, and we’re committed to making sure our customers feel heard and supported.
We appreciate you bringing this to our attention and allowing us the opportunity to assist you. We hope to continue supporting you moving forward.
The 5-day Prolon Fast is well planned…
The 5-day Prolon Fast is well planned and we finished our 6th 5-day in two years. We both were never hungry and found the program very user friendly. We also do the one day fast periodically.
8 september 2026
Antwoord van Prolonlife
Hi Everett,
Thank you so much for sharing your experience! It’s wonderful to hear that you and your partner have completed your 6th 5-day Prolon round over the past two years and have found the program so user-friendly.
We’re especially glad to hear that you’ve both been able to complete your rounds without feeling hungry.
And it’s great to hear that you’ve incorporated the One-Day Reset periodically as well. Thank you for continuing to make Prolon part of your wellness routine. We truly appreciate your support!
Thank you
The customer service has been amazing. Their advocacy has been great. The philosophy and products make a difference
8 september 2026
Antwoord van Prolonlife
Hi Carla,
Thank you for sharing your concerns. We’re sorry for the frustration this situation has caused.
Our Customer Service Team has reached out to you directly from customerservice@l-nutra.com to better understand what happened and review your subscription details with you.
At this time, we have not been able to locate a prior cancellation request or communication regarding the subscription, so we’d appreciate the opportunity to connect with you directly, clarify what occurred, and better support you in finding the best possible solution.
We’re committed to listening to your concerns and working with you toward a resolution. We hope to hear back from you so we can provide the support you need.
Terrible
Terrible - my kit was missing an item. I emailed to get t replacement and did not get a satisfactory response as to when the item would be shipped. I waited one week and no response. I had to email again before I got shipping info.
8 september 2026
Antwoord van Prolonlife
Hi Nancy,
Thank you for taking the time to share your experience. We truly value your feedback and are sorry for the inconvenience and frustration you experienced with the missing item and the delay in receiving an update.
Our Customer Service Team has reached out to you directly from customerservice@l-nutra.com to better understand your concerns, provide clarification, and support you with a resolution.
We’re glad we were able to connect with you directly and work toward resolving the issue. Your experience matters to us, and we’re committed to making sure our customers feel heard and supported throughout the process.
We appreciate the opportunity to assist you and hope to continue supporting you moving forward.
I did this strictly to lose weight
I did this strictly to lose weight. I followed the plan exactly and lost nothing.
8 september 2026
Antwoord van Prolonlife
Hi Judy,
Thank you for taking the time to share your experience. We’re sorry to hear that you did not see the weight-loss results you were hoping for, especially after following the program as directed.
We’d like to clarify that while Prolon may support weight loss, weight loss is not the primary purpose of the program. We understand that the word “diet” can sometimes lead to the expectation that Prolon is primarily a weight-loss program, but the 5-Day Fasting Mimicking Diet was designed to mimic some of the cellular effects of fasting while providing nourishment and energy to help protect lean body mass.
The primary goal is to support the body in entering a fasting-like cellular state, with weight loss considered a potential beneficial side effect. In clinical research, participants completing one 5-day Prolon cycle monthly for three consecutive months experienced an average weight loss of about 5.7 pounds, although individual results can vary.
Our Customer Service Team has also reached out to you directly from customerservice@l-nutra.com so we can better understand your expectations and experience, provide you with all the information we can, and determine how best to support you.
We truly appreciate your feedback and the opportunity to clarify what Prolon is designed to do.
Prolon exceeds my expectations.
8 september 2026
Antwoord van Prolonlife
Hi Chris,
Thank you so much for sharing your experience! We’re happy to hear that Prolon has exceeded your expectations.
It means a lot to know that you’re having such a positive experience with the program.
We truly appreciate your trust in Prolon and hope you continue to enjoy your journey with us!
2 Rounds in, it’s working for me
The NextGen soups are delicious, so are the bars and snacks. I enjoy not having to measure and cook portions myself - they make it so simple to follow the plan. I have felt and seen results from day 1.
22 augustus 2026
Antwoord van Prolonlife
Hi Lauren,
Thank you for sharing your experience. We’re so glad to hear that you’re enjoying the Next Gen soups, bars, and snacks, and that having everything portioned and ready to go has made following the program easier for you.
It’s wonderful to hear that you’ve already been noticing results after two rounds.
We truly appreciate you choosing Prolon and sharing your experience with us!
Here’s to continued progress on your journey!
Delivery issues, expiration dates, reached out 2x and no response
I rec'd my order, the box was smashed and obviously retaped, also missing an item. I reached out 2x to Prolon customer service and have had no response. I have been purchasing FMD for several years, usually using 5 or more FMDs per year. Also, very unhappy that all of the items in my order have a NOV 2026 expiration date, I stock up when there is a deal and have never rec'd FMDs and bars with this short of a window to use. It is not likely I will use them before they expire. Prolon used to be very good customer service, I loved the company before the massive advertising and oversell, higher prices. The coaching is always helpful
1 september 2026
Antwoord van Prolonlife
Hi Karen,
Thank you for taking the time to share your experience.
We’re truly sorry for the frustration you’ve experienced with your recent order, especially after being a longtime Prolon customer and having reached out to our team twice without receiving the response you expected.
We understand your concerns regarding the condition of the package, the missing item, and the November 2026 expiration dates, particularly since you like to stock up when promotions are available. We also appreciate your honest feedback about the overall customer experience and the changes you’ve noticed over the years.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com to help address your concerns and work with you toward a resolution.
We’re also grateful to hear that you continue to find value in our coaching. Your feedback is important to us, and we’ll make sure your experience is shared with the appropriate teams.
We sincerely appreciate your longtime support and the opportunity to make this right. We look forward to hearing from you and supporting you further.
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