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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Lees wat reviewers zeggen
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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You do not deliver to p.o.boxes which…
You do not deliver to p.o.boxes which my credit card goes by and didnt give a bill to AND mail to on your order form, so i guess i will stick to the 5 day waterfast which was easy for me. Mahalo
25 september 2026
Antwoord van Prolonlife
Hi Janice,
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 about the frustration you experienced with the shipping and billing address options during checkout. We understand how inconvenient it can be when the available address fields don’t accommodate your particular situation.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com to help clarify your concerns and see how we may be able to assist.
We also appreciate you sharing that the 5-day water fast has worked well for you. Thank you again for giving us the opportunity to hear your feedback, and we hope we can provide a smoother experience should you ever consider Prolon in the future.
I ended up with two boxes in my order…
I ended up with two boxes in my order instead of one because of some very deceptive discount offers that were made after. I won’t fall for this trick again and I may just avoid Prolon in the future.
25 september 2026
Antwoord van Prolonlife
Hi Rob,
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 very sorry to hear that the discount offers left you feeling that you had been misled and resulted in an additional box being added to your order. We understand how frustrating that would be, and we appreciate you bringing this to our attention.
Our Customer Service Team has already reached out to you directly via email from customerservice@l-nutra.com to better understand what happened, clarify your concerns, and work with you toward a resolution.
Your feedback is important to us, and we’re committed to making our offers and ordering experience as clear and straightforward as possible. We look forward to hearing back from you and having the opportunity to support you further.
I’m a committed PROLON customer because…
I’m a committed PROLON customer because of the company’s integrity, vast research and my personal experience of its benefits. In addition to unintended (but welcomed) weight loss, it’s the obvious reduction in inflammation that keeps me committed. The coaching sessions are so beneficial that I participate each time I fast. Thank you, PROLON!
23 september 2026
Highly Recommend
I felt invigorated for at least a week after my 5 day fast kit, and lost 10 pounds. It was my sceond time, and I just ordered a third box for mid-October. Highly recommend.
22 september 2026
Hello Prolon Team,
Hello Prolon Team,
experience was good but couldn't find how to apply my points when checking out. There was no indication to apply points. But great products.
Thank you! Fran
23 september 2026
Antwoord van Prolonlife
Hi Fran,
Thank you so much for taking the time to share your experience! I’m so glad to hear that you’ve had a good experience with ProLon and that you’re enjoying the products.
I’m sorry for the confusion around applying your points at checkout. We definitely want to make sure you’re able to use the rewards you’ve earned, and I understand how frustrating it can be when there isn’t a clear option to apply them.
If you ever have questions about your points, rewards, or anything else during the checkout process, you can always reach out to our Customer Service Team at customerservice@l-nutra.com. They’ll be happy to help clarify how to apply your points and work with you toward a resolution.
We’re always here to support you, and we truly appreciate your feedback. Thank you again for being part of the Prolon community!
My package arrived partially opened due…
My package arrived partially opened due to poor packaging and taping. The box of bars on the inside was partially opened and crumpled.I would like to share photos of the packaging with this review but unable to
18 september 2026
Antwoord van Prolonlife
Hi Sharon,
Thank you for taking the time to share your experience. We truly value your feedback, and we’re sorry to hear that your package arrived partially opened and that the box of bars inside was damaged.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com so we can better understand what happened, review the photos you mentioned, and work with you toward a resolution.
We appreciate you giving us the opportunity to look into this personally. Your feedback is important to us, and we hope to hear back from you so we can provide the support you deserve.
Great communication from the Prolon team!
I'm about to do my 4th round of the 5-day mimicking fast in the last 10 months. I have significant oxidative stress at the cellular level and I know this program is helping me along with my functional doctor's protocol. I appreciate that Prolon has a customer service number to talk to a rep when I have questions and also an email and text I receive each day during the 5 days to tell me what's going on in my body and what symptoms to expect.
21 september 2026
Prolon Not Effective; Very Difficult to Cancel Subscription! Do Not Order!
Prolon effectiveness is lacking and I’ve tried twice to cancel my subscription nd they keep sending it to me. VERY FRUSTRATED. DO NOT RECOMMEND!!!
30 juli 2026
Antwoord van Prolonlife
Hi Bill,
Thank you for taking the time to share your experience. We truly value your feedback, and we’re sorry to hear about the frustration you experienced with your subscription and your concerns about Prolon’s effectiveness.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com to confirm the status of your subscription, better understand your concerns, and work with you toward a resolution.
We appreciate you giving us the opportunity to look into this personally. Your feedback is important to us, and we hope to hear back from you so we can provide the support you deserve.
Accessing my orders
Accessing my orders, order info, subscription orders is always an exercise in frustration. And being accessed extra fees for insurance also sucks. Please just include it in the price and be done. Instead I have 2 accounts and logins to deal with (Prolon and the so-called cash-back app) that don't always talk to each other.
21 september 2026
Antwoord van Prolonlife
Hi Tiffany,
Thank you for taking the time to share your experience. We truly value your feedback, and we’re sorry to hear about the frustration you’ve experienced accessing your orders and subscription information, as well as your concerns regarding the additional protection fee and managing separate accounts.
Our Customer Service Team has reached out to you directly via email from customerservice@l-nutra.com to better understand your concerns and work with you toward a resolution.
We appreciate you giving us the opportunity to look into this personally. Your feedback is important to us, and we hope to hear back from you so we can provide the support you deserve.
Customer service is over the top!
Customer service is over the top!! FEDEX mis delivered my order and didn't receive it. Prolon sent me a new replacement order. Worked with David who was awesome keeping me loop. Well about week or so later finally the old package showed up (they took pic delivered but was not my house). Anyway contacted Prolon to say I'd happily pay for the replacement and they said not to worry about it.. AMAZING SERVICE!! GREAT PRODUCTS! GREAT NUTRITIONAL COACHING when doing the FMD one week fast!!!
21 september 2026
Review zonder uitnodiging
They were able to fix the shipping…
They were able to fix the shipping issue that I didn’t think I would be able to do anything about, which was a huge relief and help me adapt my subscription moving forward
21 september 2026
Antwoord van Prolonlife
Hi Amanda,
Thank you so much for sharing your experience!
We’re really glad to hear that our team was able to help resolve the shipping issue and make the necessary adjustments to your subscription moving forward.
We know situations like that can be stressful, so it means a lot to hear that we were able to provide some relief.
We truly appreciate you giving us the opportunity to help!
Support was great!
The online, email and text support during the 5 day fast was excellent. I was determined to see the fast through, even tho I felt hunger most of the time. Going to bed hungry, waking in the middle of the night hungry, looking forward to that delicious breakfast bar! Those are the best! Finally, on the afternoon/evening of the 5th day I felt the mental clarity and energy that was talked about. Maybe because I'm 70 and managing a cancer diagnosis it took longer. I plan to do it monthly as per my doctors orders for the foreseeable future. Maybe it will get easier each time?
16 september 2026
Antwoord van Prolonlife
Hi Linda,
Thank you so much for sharing your experience, Linda. We’re really glad to hear that our online, email, and text support helped you throughout your 5-day fast and that you felt supported along the way. And we have to agree; the breakfast bar is a favorite for many of our customers! 😊
We truly appreciate you sharing your experience, and we’re grateful you allowed our team to be part of your fasting journey.
We’re wishing you all the best and are always here to support you along the way.
Manuel
Manuel, made theCustomer Service experience easy to work with. He is polite and friendly. Kudos on
18 september 2026
Antwoord van Prolonlife
Hi Luisa,
Thank you so much for your kind review. We’re so glad to hear that Manuel made your customer service experience easy and enjoyable.
We’ll be sure to share your kind words with him, he’ll really appreciate the recognition!
It is always our pleasure to support you every time we can.
Antwoord van Prolonlife
Hi Tricia,
We’re excited to hear your Prolon arrived quickly and that everything went as expected. We truly appreciate you taking the time to share your experience with us.
Wishing you a wonderful fasting experience!
Thorough and Informative!
Answered all my questions. Very informative and excellent followup after purchase
17 september 2026
Antwoord van Prolonlife
Hi Michael,
We’re so glad to hear that we were able to answer your questions and provide the follow-up and support you needed after your purchase.
We truly appreciate your kind words and are always here to support you along the way.
False advertisement on promos
I started a new subscription with the new Prolon box kit. During checkout, my cart preview showed my 2 boxes, along with a promotional offer that included 4 free additional items (2x free fasting bar, and 2x free 1-day reset). Once the order processed, my order confirmation no longer showed any of those free items. I reached out to customer service and they did not fully honor the original offer. They offered to send me 1 of each— but again this was not the original offer and had I known, I would have waited and ordered during a different promotional period. Scammy.
14 september 2026
Antwoord van Prolonlife
Hi Daisy,
Thank you for taking the time to share your experience. We truly value your feedback, and we’re sorry for the confusion and frustration surrounding the promotional offer you saw during checkout.
Our Customer Service Team has already reached out to you directly from customerservice@l-nutra.com to better understand what happened, address your concerns, and work with you toward a resolution.
We appreciate you bringing this to our attention and giving us the opportunity to look into it. We hope to hear back from you soon and have the opportunity to provide the support you deserve.
Classy company
This is a very polished company with every detail covered from exact measurements to packaging to good taste to exellent nutrition. The rest is up to you.
16 september 2026
Antwoord van Prolonlife
Hi Karen,
We really appreciate you taking the time to recognize all the details that go into the Prolon experience, from the precise portions and packaging to the taste and nutrition.
We’re so glad to hear you’ve had such a positive experience, and we’re grateful to have you as part of the Prolon community!
Excellent customer service.
15 september 2026
Antwoord van Prolonlife
Hi Laura,
We truly appreciate your kind words about our customer service.
Our team is always here to make sure you feel supported throughout your Prolon experience.
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