Nourishment for Our

SKIN's Longevity


Nourishment for Our Skin's Longevity

Revitalization truly comes from within!

Fasting Nutri-Technology: A Groundbreaking Innovation


Nourishment for Our Skin's Longevity

The skin, the largest organ in our body, mirrors our inner health. Its vitality, radiance, suppleness, and healthy against aging rely predominantly on the nutrition we ingest, more so than the creams we apply. Optimal nutrition impacts the whole skin surface of our body, not just the face and neck, representing merely 3.5% of the total skin.

New Evidence: Skin, Confidence, & Happiness

On February 21, 2023, the Journal of Clinical Medicine published the skin and emotional results of a randomized clinical study on ProLon's 5-Day Fasting Nutrition. The study recruited 45 healthy women aged between 35 and 60 and found that the group that used ProLon three times over three months (5 days per month) reported significant improvements in skin hydration, health, texture, and roughness even after the first cycle. Moreover, study participants reported statistically significant improvements in confidence and happiness levels.

ProLon Regimen: The Science & Patents

ProLon's 5-Day Fasting Mimicking Diet, backed by over 30 clinical trials, is known for its benefits on metabolism, cardiovascular health, and supporting healthy aging. Recognized by the US and European patent offices with over 40 patents, including one for enhancing rejuvenation and longevity, the secret of ProLon lies in its formulation that does not spike pro-aging factors in the blood and goes undetected by the cells. Indeed this precision formulation is made of plant-based clean ingredients that do not trigger the Cellular Nutrient Sensing Pathways, tricking the cells into believing they are fasting while they are nourished. This Novel fasting with-food method induces physiological fasting and its benefits while the body is consuming nutrition.

Many ProLon users report emotional benefits such as improved confidence, happiness, mental clarity, energy, and sleep. Additionally, they often experience a change in their relationship with food, expressed as lower cravings, reduced late-night snacking, and less need for large food portions. The ProLon 5-Day Fasting Nutrition was even awarded in 2022 as one of the best three products for employee wellness. Click here to read the Fasting Mimicking Diet Patents or here for the published clinical trials.

How often should you undertake the ProLon regimen?

For skin rejuvenation, you only need to complete 3 ProLon regimens per year. To amplify the weight loss and healthy aging benefits, you can take the regimen once every quarter or four times yearly. Start your three ProLon Regimens

Unveiling the Secret

The secret lies in Autophagy–a biological miracle rooted in our epigenetics, observed in our ancestors and contemporary centenarians (people living 100 and beyond). Autophagy, a cellular cleansing, detoxing, and rejuvenating process activated by fasting, is a practice that was prevalent in our ancestors' lives. With our current dietary habits, the practice of fasting has been lost, and our cells, including skin cells, have started to age biologically faster, losing their vibrance and hydration.

For over a decade, the National Institute for Health has sponsored researchers at the Longevity Institute of the University of Southern California to develop a specialized 5-day diet that supports people to eat a healthy plant-based, gluten-free, low glycemic index formulation that mimics fasting in the body and provides its benefits. This novel fasting-mimicking formulation was then examined by 18 universities to showcase its myriad health benefits.

ProLon: More Than Just a Product

At L-Nutra, our mission is fueled by a deep commitment to human health and longevity. By pioneering advanced Nutri Technology, we strive to empower everyone to support their biological age and potentially reverse the aging process. With ProLon, we have harnessed the potent benefits of fasting and packaged it into a convenient and delicious 5-day program.

ProLon is not merely about radiant skin; it is about embracing a holistic approach to health, embodying confidence, and thriving with happiness. The carefully crafted ProLon regimen supports cellular rejuvenation, improves skin quality, and enhances mental clarity. Join our community of ProLoners and start your journey towards better health, improved skin, and a renewed sense of well-being.

ProLon also cares about the environment and sustainability and therefore does not use animal or chemical source ingredients.

Be a part of the revolution–the ProLon revolution to support your and the planet's health and longevity.
Start your three ProLon Regimens

The only scientifically tested fasting nutrition program.

Backed by 20 years and $36 million in research & development

Give your body and your cells the rejuvenation they need!

Cellular Rejuvenation (Autophagy)

A fasting induced miracle of biology called autophagy (which won the Nobel Prize in Medicine in 20), cellular rejuvenation is key to your vibrance, emotions, performance, mental clarity,healthy aging and longevity.

Changed Relationship
with Food

In this 5-day journey, ProLon helps you to understand, appreciate, and change your relationship with food. You can successfully function without all the mindless eating and extra calories.

Improved Sense
of Well-being

Your emotional well being is a huge benefit as most people after ProLon feel successful vs the other long term diets that set you up to quit. Feel empowered, rejuvenated, vibrant, and with more mental clarity.

Healthier, Younger
Looking Skin

Clinically shown after 3 cycles of ProLon (15 days total), to reduce fine lines and wrinkles. Your skin is rejuvenating from the insdie out, which users come to love!

Convenient, Fits Into Every Lifestyle

The beauty of ProLon Fasting Nutrition is it is in 5-day cycles. We recommend doing at least 3 cycles a year (only 15 days). You can include ProLon into your already healthy routine with minimal disruption.

Fat Focused
Weight Loss

Kickstart weight loss (on average 5 pounds), especially belly fat, while protecting lean body mass, (which althletes and performance minded will love). The key is your body thinks your fasting, while you're staying nourished.

More from our customers

I expected to be hungry and then..

I expected to be hungry and then HANGRY, on this program. I was extremely surprised by the fact that not only was I NOT hungry, I also didn't crave my usual nightcap. I really didn't have any cravings for the most part, of course smelling the food I was cooking for my family smells good, but I didn't feel like I NEEDED to eat it. Which was one of the main reasons I wanted to try this program. I enjoyed the food. I did NOT like the drink we had to sip on. The flavor was just not my jam. But other than that I have been pleased with how I feel. I work very hard for a living and I usually need a bit more to eat during the day, NOT this week.

Sara Snyder

This was my10th Prolon fast

This was my 10th Prolon fast. I used this one to reset myself due to having long COVID. I can't begin to describe how much better I feel after doing a prolon fast

Robin Laabs

Amazing Program

This is my second time using Prolon. It is so easy to follow and stay on the fasting plan for better health. I lost 6 pounds at the end of five days. I feel great. My bpm dropped 5 points and My anxiety level is nonexistent.


I use FMD as a reset whenever I fall off the wagon!

This is my third time trying the fast mimicking diet, and I have learned to go back to it whenever I need a reset. I tend to do great at watching what I eat for a period of time, but then start slipping back into old habits over time. At that point, I find that if I do the fast mimicking diet again, it really does reset my thinking about how much I need to eat. Basically if I can get by on 700 to 800 cal per day for five days during the diet, then I can easily bump that up two maybe 1200 calories per day, and keep that going for an extended period of time, once the diet is over.


Prolon leaves the guesswork out of..

Prolon leaves the guesswork out of fasting! The system is super easy to follow and even includes a transition day diet. I always feel great during day and have high energy. I sleep so deep! I love that Prolon makes it so simple to take care of my body on a cellular level... thank you Prolon! Kimberley

Kimberley M.

it is a hard program but it works

it is a hard program but it works. I would not lie, I cannot believe I completed it. I lost 6 pounds and feel really amazing. I will continue with a modified Keto program moving forward

Veronica Diaz

My first 5 day Fast

This was a great experience! I feel amazing, and have so much energy and focus. The food tastes great! I've already recommended to all my friends.

Julie S

L-Nutra Reports First-Ever Study Showing ProLon® Improves Skin Health, Happiness, and Confidence

SANTA MONICA, Calif., February 27, 2023 ( - L-Nutra Inc., a leading nutrition technology company that pioneers the discovery, design, and commercialization of novel nutrition programs that impact cellular rejuvenation and support healthy aging, announced the results of a first-ever study evaluating the impact of its Fasting Mimicking Diet (ProLon®) on skin hydration, texture, and psychological well-being in women.

The study, which was published in the Journal of Clinical Medicine, is the first randomized controlled trial demonstrating the efficacy of a five-day Fasting Mimicking Diet (FMD) Nutrition protocol on enhancing skin quality, smoothness, hydration, and key components of psychological well-being. Skin health and mental wellbeing are common concerns among women, and this research provides compelling evidence for the effectiveness of FMD Nutrition in improving overall health. 

"This study demonstrates the holistic and systemic impact of the Fasting Mimicking Technology affecting cellular rejuvenation from as deep as the inner organ systems to the surface tissue like skin. Together with other published FMD studies in diabetes and cancer, this research further validates that FMD Nutrition is a powerful tool in Lifestyle medicine to improve overall health," said William Hsu, MD, Chief Medical Officer of L-Nutra Inc. 

The researchers recruited 45 female participants, ranging from 35 to 60 years old. The group that used the FMD Nutrition five days per month for three consecutive months had significant improvements in skin hydration as measured by Corneometer, as well as maintenance of skin texture, smoothness and tone evenness, compared to individuals in the standard of care group. Participants also reported significant improvements in feelings of happiness, confidence and empowerment to take control of their health, as well as optimism about the future. 

 "This successful clinical trial is another testimony for the rejuvenative power of the Fasting Mimicking Diet. Our goal is to help everyone live a long and healthy life by keeping our biological age younger than our chronological age. Through this trial, we have demonstrated what many of our ProLon® consumers have reported for years, a healthier looking, glowing skin, which helps people around the world feel happy and confident about their lives," said Joseph Antoun, M.D., Ph.D., CEO and Chairman of L-Nutra Inc.  

Product image

ProLon® Fasting Nutrition Plan

Product information


4.7 out of 5 stars

Product options

or pay in 4 easy installments with

With ProLon, you get everything you need pre-packaged and ready to go. Each kit comes with five boxes which are labeled by day so you know what to eat each day.


Original Soup Flavors: Vegetable, Minestrone, Minestrone Quinoa, Mushroom, Tomato. — or—


Gen3: Red Bell Pepper & Onion, Green Pea & Chives, Lentil Curry, Chickpea & Leeks, Carrot Ginger


Soups: A variety of easy-to-prepare soups made with a proprietary mix of all-natural, plant-based ingredients

Nut Bars: Cold-pressed, delicious nut bars with whole ingredients like almonds, macadamia nuts, and pecans

Snacks: Snacks like olives from the South of Spain where olive consumption is associated with longevity, and kale crackers enriched with plant-based protein.

Supplements: Dietary supplement packed with multivitamins, amino-acids, minerals and omega-3 fatty acid to provide the body with nourishment

L-Drink: Fruit-flavored, proprietary glycerol mix designed to fuel and protect muscles throughout the fast

Herbal Teas: Caffeine-free herbal teas loaded with healthy antioxidants, and will keep you hydrated during your week.

ProLon is a 5 days only nutrition program that was designed and tested by 14 global universities to nourish you with premium quality plant based food, while inducing the cellular, metabolic, and emotional benefits of prolonged fasting.

It is a scientific breakthrough that took 2 decades, $48MM in research. and awarded 40+ patents — including the only patent in history on a nutrition program to enhance longevity and healthspan.

Prolonged fasting (>2-3 days) has unique benefits such as autophagy or cellular rejuvenation which was awarded the 2016 Nobel prize in Medicine.

Indeed, the first 2-3 days of fasting, the body burns fat to compensate this first stage of calorie deficit but thereafter fasting becomes a positive stress on each of your body’s cells which then goes through rejuvenation and autophagy, a key miracle of our human biology that is critical healthy aging and longevity.

You are as healthy (body, mind, and soul) and vibrant as your cells are. Add ProLon to your everyday lifestyle and rejuvenate your cells.


ProLon, essential to vibrant life!

Healthy Aging

Cellular Rejuvenation

Metabolic Support

Burn Visceral Fat

Protect Lean Muscle

Changed Relationship with Food

More Energy

Mental Clarity

Rejuvenated Skin

Backed by & continually advancing through science.

Get the benefits of fasting without getting exhausted...

Get the benefits of fasting without getting exhausted and burning off all the muscle. I resumed heavy weight lifting right after the fast. This really is a breakthrough.

I can’t recommend ProLon enough...

I discovered ProLon last January and I have been doing it consistently ever since then. It is a really great reset for your body, especially after holidays. It has so many different benefits, it curbs sugar cravings and helps me manage portion control.

I'm 50 years old with 2 small children...

I started ProLon and I'm telling you, it worked! I lost 6 pounds, I have no brain fog, I absolutely do not crave sugar right now which is insane and I actually feel amazing, I'm full of energy! I am so proud of myself, my husband did it with me, he lost 5 pounds, says he has never felt better.

Vibrance from the inside out through cellular clean-up.

Through the 5-day ProLon Fasting Nutrition Program your body will enter different stages of renewal and rejuvenation.


Transforming to a Fasting State

The body transitions into a fasting state & fat-burning mode so it can begin cellular clean-up.

Fat burning & Ketogenesis

Fat-burning ramps up, contributing to the initiation of ketogenesis (ketone production). By the end of this day (48hrs), ketosis may occur.

Autophagy / Clean-Up State

Cellular cleanup (autophagy) begins. Fat-burning and ketone production/utilization continues and increases.

Cellular Rejuvenation

Cellular cleaning/renewal & fat-burning continues. Your cells begin looking like younger versions of themselves. You're in the final stretch.

Renewal & Change

Fast completed, cellular renewal continues beyond day 5. Sustained cellular recycling, rejuvenation, and renewal. Sustained ketosis may occur.


The amazing part about ProLon is it can easily fit into your lifestylle and is only a 5 day change to your normal life.

Suggested consumption by Dr. Valter Longo, head of the Longevity Institute at University of Southern California and Author of the Longevity Diet.

• If you have a health or metabolic objective in mind and want to achieve faster the metabolic and rejuvenative successes of ProLon, then you can do ProLon every month for 3 or 4 months and then do it once every 3 months to maintain the benefits.

• 2 times only per year for Healthy Aging (10 days out of 365 days!)

• 3 times per year for Healthy Aging and added Weight Loss (15 days out of 365 days!)

Some people do ProLon once a month for reasons that are in line with therapeutic effects of fasting that we are also researching and will launch under a dietitian guided program in 2023.

The diet should be used for five consecutive days, after which the individual will transition on the 6th day and then resume their normal diet. The program provides a meal card that recommends how to consume the items for each day, but each day’s items can be consumed in any order you wish, as long as you only eat each day’s items during that day (do not carry them over to the next).

While there are many different signaling factors in the “nutrient-sensing pathways” involved with cellular fasting, the 3 primary nutrient-sensing pathways that ProLon and fasting down-regulate are IGF-1, mTOR, and PKA. The process is complex, and each pathway can interact with other pathways, but in general, PKA responds primarily to sugar and carbohydrates, while IGF-1 is primarily responsive to protein (and more strongly triggered by animal protein), and mTOR is triggered by IGF-1 and amino acids. Sugar and carbohydrates (and to some extent caffeine) will activate PKA. These nutrient-sensing pathways all help regulate the cells’ growth cycles and stress-resistant “fasting” state.

ProLon provides the body with a scientifically developed, naturally occurring combination of macronutrients (fats, carbohydrates, proteins) and micronutrients (essential vitamins and minerals) designed to keep the body nourished while going through the rejuvenating process of the fasting state. 


Day 1: Transforming to a Fasting State: Your body is transitioning to a fasting state and fat- burning mode, and begins preparation for cellular clean-up.

Day 2: Fat Burning & Ketogenesis: Fast Burning & Ketogenesis: Fast-Burning ramps up, contributing to the initiation of ketogenesis (ketone production). By the end of this day (48 hours), ketosis may occur.

Day 3: Autophagy Clean Up State: Cellular clean-up (autophagy) Fat-burning and ketone production/utilization continues and increases.

Day 4: Cellular Rejuvenation:Cellular cleaning/renewal & fat-burning You’re in the final stretch.

Day 5: Renewal & Change: Fast completed, cellular renewal continues beyond Day 5.

While the purpose of the ProLon diet is to trigger rejuvenation, weight loss may occur. Everyone is different, and weight loss depends on a number of factors. In a clinical study of participants who completed a 5-day ProLon cycle once a month for three months, the average weight loss at the end of the study was about 5.7 pounds. This was primarily abdominal fat, while lean body mass was preserved.

Day 1 has about 1100 calories (kcals), while Days 2-5 have between 700 and 800 calories (kcals) per day.