ProLon Review

UPDATED July 15. 2024.
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ProLon is one of the most intriguing weight loss programs to enter the US market in recent years. It is a meticulously tested, science-based, minimum-effort diet that promises to help you reap all the benefits of fasting while enjoying more than just a couple of glasses of water. It is praised by dieters, recommended by doctors, and also pretty expensive. The question is whether it is worth the cash and whether it can help you achieve your weight and health goals. This is exactly what we aim to discover in this all-encompassing ProLon review.

ProLon printscreen homepage

What Is ProLon

ProLon is a 5-day diet designed to help you lose fat, rejuvenate your body, and improve your overall health. It belongs to the first generation of fast mimicking diets developed by L-Nutra, a Los Angeles-based nutritech company operating since 2009.

The company was founded by Dr. Valter Longo, the Director of the Longevity Institute at the University of Southern California. Dr. Longo is the creator of the award-winning Fast Mimicking Diet (FMD) concept, which is the result of 2 decades of research on the effects of fasting. This is the very concept behind the ProLon diet.

ProLon meals dietary program with tea

While rather complex in nature, FMD can be described in plain words as a dietary program that provides your body with the essential nutrition it needs while tricking your cells into thinking that you are fasting. You get to keep your body healthy by fueling it with small amounts of carefully selected healthy fats, plant-based proteins, and carbs packed with fiber. At the same time, your body is put into fasting mode, which should result in visceral fat loss, cellular protection, self-repair, and rejuvenation, lean body mass maintenance, optimal metabolic balance, and potentially even increased lifespan.

For years, Dr. Longo and his team worked on identifying the nutrients that could keep your body in good shape while going undetected by food-sensing neurons, thus mimicking fast and allowing your body to experience all the scientifically identified benefits of fasting. The result of this hard work is the ProLon diet that you can try out at home with the company’s 5-day kit that contains everything you need to successfully go through the program and improve your shape and well-being.

ProLon entered the US market in 2016. In the meantime, numerous doctors and dieters have recognized it as an excellent weight loss and body rejuvenation solution that can produce highly positive, even life-changing effects.

ProLon For Weight Loss

While ProLon is much more than just a weight loss program, in this ProLon review, we have decided to focus on the ways it can help you lose extra inches and pounds and improve your body mass index. In the following sections, we will discover whether and why ProLon is effective, whether it truly constitutes a good choice for your health, and whether there are any potential negative effects you should worry about.

Does The ProLon Diet Work

The ProLon diet’s effectiveness has been clinically proven. Based on the conducted trials, the average weight loss among ProLon users with no major medical issues amounts to 5.2 pounds of fat and 1.2 inches around the waist after 3 monthly cycles.

These mean values were calculated based on the results achieved by 100 healthy participants who were on the ProLon 5-day diet every month for 3 consecutive months. Therefore, the participants actively dieted for only 15 out of 90 days of the duration of the trial, in accordance with the rules of the program. In the meantime, they enjoyed a healthy diet without a reduction in calories.

ProLon dietary program top view

Speaking of calories, ProLon does not force you to limit your daily intake to 0-600 calories like regular fasting. Instead, it ups the intake to 1,100 calories on the first day and about 770 calories per day on the remaining 4 days of the program.

Obviously, the calorie intake of 770 to 1,100 calories is still extremely limited. To prevent the common negative effects of radical calorie-restricted diets, ProLon products contain carefully selected substances that ensure the maintenance of healthy levels of metabolic markers.

To sum up, ProLon does not promise to help you lose 10 pounds in a week, but it does efficiently combine the weight loss benefits of fasting and calorie restriction and controlled, science-based nutrition to yield visible, sustainable results.

Why Does ProLon Work

The secret to ProLon’s success lies in the fact that it represents a healthier, safer, scientifically designed way to fast. It uses controlled nutrition to combine the proven weight loss benefits of fasting with positive changes in overall health.

Namely, you may be familiar with the fact that traditional, water-based fasting can be dangerous, especially is the person fasts for more than a few days. However, what Dr. Longo and his team have established is that fasting for 4-5 days every once in a while can greatly help with cell regeneration and rejuvenation. This inspired them to come up with a minimized-risk fasting solution.

To achieve this goal, Dr. Longo dedicated a large portion of his career to the explorations of the ways cells sense food. The results of his research allowed him to create a fast mimicking program that allows the body to remain in the fasting mode while staying nourished. Put simply, he came up with an innovative, scientific way to cheat while fasting.

As it prevents deprivation, ProLon leads to better and more sustainable weight loss results than water-only fasting. It reduces the fast-induced urge to overeat and diminishes the chances of giving up on the diet because it is too difficult to follow. Thus, it represents an easy, safe, and effective solution for reaping all the benefits of fasting without much effort or the usual suffering.

What You Get To Eat On The ProLon Program

With ProLon, you do not have to memorize approved food lists, spend time in the kitchen preparing your daily meals and snacks or sweat for hours at the gym. You do not have to modify your schedule to suit your new diet or think about what you should or should not eat. You have all the food and drinks you should consume during the program ready-made, packed in a box, and delivered to your home.

Your only job is to stick to your ProLon menu and avoid consuming anything that does not come in your ProLon dieting kit. Since your calorie intake is significantly reduced, exercising is not a part of the program.

ProLon box pack

Therefore, during the 5 days on the ProLon diet, you do not need to change anything other than your eating habits. Your dieting kit includes a full list of meals you get to enjoy each day. You do not need to eat them in the exact order shown on the daily menu, but you do need to make sure you do not eat your Wednesday meals on Monday. That is, you need to stick to each day’s menu and strictly avoid swapping one day’s meal for another.

Like we said earlier in this ProLon review, your first day on the program allows you to eat more calories than the remaining 4 days. You can expect your first day’s menu to include:

  • A cup of tea, a nut-based bar, and algal oil for breakfast;
  • A small serving of soup, olives, crackers, and 1 capsule of NR-1 supplement for lunch;
  • A cup of tea and a nut-based bar for your afternoon snack;
  • A small serving of soup, a bar, and 1 capsule of NR-1 supplement for dinner.

Other days also include breakfast, lunch, dinner, and an afternoon snack, but the meals include fewer components. On day 2, you get to enjoy:

  • A cup of tea and a nut-based bar in the morning;
  • A small serving of soup, olives, and 1 capsule of NR-1 supplement for lunch;
  • A cup of tea and olives for your afternoon snack;
  • A small serving of soup, a bar, and 1 capsule of NR-1 supplement for dinner, plus the specially formulated glycerol concentrate called L-Drink.

Your menu for day 3 would feature:

  • A cup of tea and a nut-based bar for breakfast;
  • A small serving of soup, crackers, and 1 capsule of NR-1 supplement for lunch;
  • A cup of tea for your afternoon snack;
  • A small serving of soup and 1 capsule of NR-1 supplement for dinner, plus L-Drink afterward.

The menu for day 4 is the same as the day 2 menu. The only difference is that you get to try out a different soup flavor.

Finally, on day 5, you get to enjoy:

  • A cup of tea, a nut-based bar, and algal oil for breakfast;
  • A small serving of soup, crackers, and 1 capsule of NR-1 supplement for lunch;
  • A cup of tea for your afternoon snack;
  • A small serving of soup and 1 capsule of NR-1 supplement for dinner, plus L-Drink for later.

Since all of these products are included in the ProLon kit, meal prep is mostly reduced to adding water to the menu items that require it. To reiterate, you cannot eat or drink anything else except for water.

As you can see, the ProLon diet is perfectly easy to understand and follow since you merely need to get your kit and follow the 5-day menu provided. The feeling of hunger is not uncommon, but it is not as overwhelming as in the case of water-only fasting. Besides, the diet only lasts 5 days, so it is not that difficult to make it to the end.

After the 5-day dieting cycle, you go through 1 transition day. You start day 6 with liquids like juice and soup and then enjoy light meals consisting of rice or pasta and a bit of meat, fish or legumes. Then you can go back to eating the same way you normally do, just make sure you do not overeat and stick to healthy choices.

Is ProLon Healthy

ProLon has been clinically shown to produce a vast array of positive health effects. In addition to a decrease in overall weight and body fat including visceral fat, it is known to promote cell rejuvenation, metabolism improvements, and longevity.

According to the results of scientific research published in multiple peer-reviewed journals, ProLon can help you lose fat while:

  • Increasing your cells’ stress resistance and ability to self-repair;
  • Keeping your glucose, CRP, triglycerides, cholesterol, insulin resistance, and blood pressure in check;
  • Preserving lean muscle mass;
  • Promoting longevity by influencing the aging marker known as IGF-1.

These impressive results speak in favor of ProLon being a great choice for improving health through diet. As trials have shown, it can help you get into shape, rejuvenate your body, increase your energy levels, and potentially live longer.

However, since ProLon is a calorie-restricted diet, it is not recommended for all dieters. A consultation with a doctor is necessary for individuals over the age of 70 as well as those who suffer from diabetes, cancer or chronic diseases.

Furthermore, the diet is not suitable for women who are pregnant or breastfeeding, persons who are underweight, and dieters allergic to ingredients in ProLon products, including nuts. In case of an infection, the use of ProLon products should be postponed until the infection clears up.

You can only go through the 5-day dieting cycle once a month. It is a good idea to talk to your doctor and see if you can use ProLon for 2 or more consecutive months or take a break.

How Does ProLon Delivery Work

As a ProLon customer, you can decide whether you want to shop with or without a subscription. You can purchase 1, 2 or 3 ProLon 5-day dieting kits at once or you can subscribe and receive 1 kit per month or more rarely, depending on your needs.

At the moment, the company offers 6 different subscription options. You can opt for the 3-month subscription and get a kit per month for 3 months or you can go with an on-going subscription and receive a kit every 1, 2, 3, 4 or 6 months. On-going subscriptions allow you to cancel anytime while the 3-month subscription requires you to wait until the end of the subscription period.

Unlike many other weight loss programs, ProLon does not have different meal plans for different dieters and it does not allow you to purchase its products a la carte or choose what you want to receive in your delivery. It has a single, specially designed dietary kit available in 2 variations that exclusively differ in the soup flavors included. We will talk more about the contents of the kit in the following section of this ProLon review.

At checkout, you can decide whether you want to get more of the company’s bars as add-ons and extend your fast if desired. These bars that can be enjoyed outside the program are known under the name of Fast Bar. They can aid your independent fasting endeavors and serve as healthy meal replacements.

Before we move on, it is important to note that all Fast Bar sales are final. On the other hand, unopened ProLon dieting kits can be returned within 30 days of receipt. If you return your kit on time and in good shape, you get a full refund minus a $50 processing/restocking fee. Potential shipping charges cannot be refunded. If you receive a damaged product, you qualify for a free replacement.

ProLon Meals And Recipes

ProLon meal options
Weight Loss

As suggested earlier in this ProLon review, the company’s online shop only features 2 products. These include the 5-day dieting kit available in 2 variations and the Fast Bar available as an add-on.

The 5-day dieting kit includes:

  • 5 single-serving soup blends (1.16 to 1.23 ounces per packet);
  • 9 single-serving nutrition bars known as L-Bars (0.8 to 1.6 ounces per bar);
  • 5 servings of olives (5 olives per serving);
  • 3 servings of kale crackers (1.16 ounces per serving);
  • 10 servings of tea;
  • 2 servings of algal oil (Omega-3 supplement);
  • 10 NR-1 supplement capsules;
  • 4 servings of L-Drink (glycerol concentrate).
ProLon five day program

The original kit features the following soup flavors:

  • Vegetable
  • Minestrone
  • Vegetable Quinoa
  • Mushroom

The second variation of the kit allows you to enjoy a somewhat different set of soup flavors, including:

  • Butternut Squash
  • Minestrone
  • Butternut Squash with Quinoa
  • Spinach with White Bean
  • Tomato

As far as L-Bars are concerned, you always get nut-based and choco crisp bars. L-Drink flavors include orange and tropical berry while tea flavors are hibiscus, spearmint, and spearmint lemon. Finally, you get to enjoy both garlic flavored and sea salt flavored olives.

Unlike L-Bars, Fast Bars always feature nuts and they are available in 3 flavors – nuts & honey, nuts & nibs, and cocoa nuts.

While the servings are extremely small, everything tastes pretty great. Therefore, while you should not expect to feel full all day, you are likely to enjoy the products in your kit. For more good news, the products are suitable for virtually everyone, including vegans, vegetarians, and keto dieters. They rarely contain allergens, apart from nuts.

How Much Does ProLon Cost

The standard price of the ProLon 5-day fasting kit is $249. However, you can pay much less if you choose to subscribe or if you buy multiple boxes at once. Shipping is always free, regardless of the number of kits you order and whether you subscribe.

ProLon box priciing options

Apart from your kit, you can order the company’s proprietary Fast Bar. It is available in 5-packs that cost $16 per pack and 10-packs that come at the price of $30 per pack.

For added clarity, here is a simple pricing overview showing you how much you can expect to pay for ProLon products depending on the ordering option you choose.

As you can see, even with the free shipping policy and the $24-per-kit discount on subscriptions and larger orders, the prices are rather steep. They are justified by the decades of research that went into the creation of ProLon, but their acceptability depends on the individual dieter’s budget.

ProLon 5-Day Kit
Ordering methodPrice per kitPrice per day
1-2 kits bought subscription-free$249.00$49.80
3 kits purchased at once$225.00$45.00
Monthly subscription$225.00$45.00
Fast Bar
Pack sizeTotal pricePrice per bar

Where Does ProLon Deliver

Due to the popularity of its products, ProLon ships to all 50 US states as well as a number of other countries worldwide. It delivers to Canada, Australia, New Zealand, Malaysia, South Africa, South Korea, and about a dozen countries in Europe.

At the moment, the list of European countries where ProLon is available includes the UK, Italy, France, Spain, Germany, Poland, Sweden, Denmark, Finland, Norway, and Iceland.

All US orders are shipped via FedEx. For international deliveries, the company has opted for UPS as its default carrier.

If you place your order by 1 PM PST, you can expect it to be shipped within 24 hours. Otherwise, you may need to wait a day longer for it to be dispatched. Once shipped, continental US orders generally arrive within 4 business days, unless rush delivery is chosen, in which case the transit time is shortened to a maximum of 3 days. Deliveries to Alaska, Hawaii, and international locations usually take a few days longer, depending on the distance.

Tracking information is provided for all orders. No signature is required upon receipt, so you do not have to sit around at home and wait for your box to arrive.

ProLon Pros & Cons

To make sure ProLon meets all your standards and expectations, it is important to know its biggest advantages and disadvantages. With a short overview of its pros and cons, you can easily decide if ProLon is the right meal delivery service for you.

  • Scientifically based and proven
  • Doctor recommended
  • Easy to follow
  • Safe and suitable for health improvement
  • All drinks and foods allowed are included in the kit
  • Pleasant flavors
  • Free shipping


  • High price
  • You need to wait a bit for visible results

Bottom Line

If ProLon fits your budget, we see absolutely no reason why you should not give it a try. While you should not expect instant dramatic results, you can expect to slim down gradually and steadily and become healthier along the way. The program is firmly rooted in science and it proved to work extremely well in clinical trials. Considering that it requires virtually no lifestyle modifications except for a major change in eating habits for 5 days, it is one of the easiest solutions for improving your shape, health, and overall well-being.

User Reviews (7)

ProLon is rated 4/5, based on 7 user reviews.

The ProLon reviews listed below reflect the opinions and experiences of real users and are in no way influenced by the service reviewed here. Before publishing each review, our team checks whether it was submitted by an actual user in an effort to prevent false or spammy reviews.

  1. | March 9, 2020

    I like that you don’t have many options to choose from but the soup flavor. When I’m on a diet that allows me to pick what I want to eat or substitute it with something else I often just continue to eat like I did before and don’t end up doing anything right. With Prolon, I’m limited to a few tiny packs of food like things for 5 days and I know I can’t eat anything beside it. It really helps me with the mental preparation which is the basis of every successful diet.

  2. | March 3, 2020

    It was almost 300$ if you count in the bar packs but it was worth it! I’ve lost weight and it only took 5 days. I just hope I won’t mess it up now since I feel hungrier than before.

  3. | January 23, 2020

    I feel great! I’m not hungry, I feel light and I really think I get everything my body needs through these meals. I would do it more often if it wasn’t so expensive!

  4. | January 9, 2020

    Did nothing for me at all! And I was hungry all the time. No amount of soup can make up for a fact that I need real food to get through the day, I was honestly hoping that this will be different by it’s basically the same old bs like every other loose weight in a week program!

  5. | December 28, 2019

    Of course, I was skeptical at first but it turned out to be exactly like advertised. Prolon diet really works! I’ve lost the extra weight extremely fast and didn’t feel hungry at all! Plan n doing the program once every 6 months just to detox and cleanse my body.

  6. | December 22, 2019

    Absolutely worth it! I feel better than ever after just 2 cycles. I actually can’t wait for the next cycle because of how light I feel during. Seriously awesome!

  7. | November 20, 2019

    Great for lazy people like me, but it really is more expensive than it should be. Everything is ridiculously small! I mean, I feel silly eating it. But hey, it works, so if you can’t eat healthy on your own like I definitely can’t, it’s a pretty cool way to lose a few pounds without much stress.

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