Prolon specializes in programmes that are positioned to potentially mimic the effects of fasting while providing nourishment and energy to support normal bodily functions.
The brand builds its programs around fasting science and longevity research, offering low-calorie meals, which may support cellular repair, metabolism, and fat oxidation. Its lineup also extends to formulations that may complement fasting programmes, such as fasting-friendly bars and shakes, protein bars and shakes, and bundled offerings like the Reset 1-Day Kit and Longevity Nutrition Kit.
This review provides a detailed look into the brand’s background and science-forward fasting approach. It also provides a clear breakdown of its main programmes, complementary product offerings, associated advantages, and potential brand limitations. The review also compares Prolon’s programs with standard DIY FMD programs.
Developed by L-Nutra Inc., Prolon is a wellness brand that focuses on a science-driven approach to fasting and nutrition. The brand presents itself as a provider of structured, fasting-mimicking programs that may help support autophagy, a fasting state where the body undergoes cellular renewal, thereby supporting metabolic health.
Its core offering is the 5-Day Fasting Mimicking Program, a patented plan tailored to keep your body in a fasting state while still allowing you to eat pre-packaged, plant-based foods. The program claims to support fat loss with added benefits like muscle protection, renewed energy, and improved focus. As part of the program, you are also eligible to receive daily tips from nutrition experts, videos, and expert-led group coaching.
Under its longevity-focused lineup, the brand offers products like the L-Protein to support muscle preservation during periods of calorie deficits and L-Spread, a protein spread that features Apulian almonds to support satiety and suppress cravings.
As part of its intermittent fasting lineup, the brand offers products like the Fasting Bars, which feature packs of 12 fasting-compatible bars, available in chocolate chip, nuts and honey, and coconut macadamia flavors. It also offers the Fasting Shake, which features 21 essential nutrients that may support appetite control and promote fat breakdown.
The brand claims that its programs and formulations are built on the research of Dr. Valter Longo, whose experience in fasting and aging biology explores how nutrient-sensing pathways respond to food. His studies guide the brand’s objectives of helping you access the protective and rejuvenating effects associated with prolonged fasting.
L-Protein is a plant-based protein powder that may support muscle repair and growth, daily protein needs, and appetite control. According to the official site, it features 25g of protein sourced from peas and black beans, 190 calories, and 3g of total sugars per sachet (48g). The product also features 21 essential nutrients, including vitamins C, D, A, E, and B-complex vitamins, alongside minerals like zinc, copper, selenium, and chromium.
As per the manufacturer, the pea-sourced protein could support post-exercise recovery and everyday nourishment, while maintaining diminished levels of insulin-like growth factor 1, a pathway linked to accelerated aging. The formulation comes in packs of 12 single-serving sachets, available in berry and chocolate flavors.
Pea protein supplies branched-chain amino acids like leucine, isoleucine, and valine, which may help stimulate muscle protein synthesis for muscle growth and repair. Black bean and chickpea proteins add lysine, methionine, and tryptophan, which help form a complete amino acid profile that could support tissue repair and enzyme function.
L-Protein also features kale, spinach, broccoli, sweet potato, sunflower seed, cranberry, and mushrooms like maitake and shiitake. These vegetable and mushroom extracts provide phytonutrients and antioxidants that may help lower oxidative stress from physical activity while supporting immunity. As per the makers, L-Protein is dairy-free, GMO-free, soy-free, and silica-free.
Prolon’s 5 Day Fasting Mimicking Program is a structured five-day eating plan, intended to keep your body in a fasting state while allowing you to consume the specific foods that come in the program kit.
The brand states that the program may offer functional benefits, including fat loss with muscle protection, a more balanced relationship with food, improved energy levels, and enhanced focus.
The program comes with a kit that features five labeled boxes so you know what to consume each day. These labeled boxes contain plant-based soups, cold-pressed nut bars made with almonds, macadamia nuts, and pecans, alongside snacks like olives and kale crackers. Such boxes also include supplements like multivitamins and amino acid blends, a fruit-flavored glycerol-based L Drink, and caffeine-free herbal teas.
The 5 Day Fasting Mimicking Program is centered on autophagy, which is the natural process through which your bodily cells remove and recycle damaged components during fasting. According to the makers, the controlled calorie pattern and nutrient design in the program may help stimulate fasting-like cellular activity without requiring total food deprivation.
All items in the kit come prepackaged, and the program requires you to commit to five consecutive days based on the labeled daily portions. You are to consume only what is included in the kit, along with water and the teas. The program also provides access to daily tips, videos, education, and optional group coaching for added support.
Fasting Shake is a powdered mix formulated to give you macro and micronutrient support while promoting autophagy (fasting state). It is intended for use during the fasting window to help maintain satiety and support fat burning. As per the official site, one sachet (38g) contains 210 calories, 17g of total fats, 8g of dietary fiber, and 3g of protein.
The shake features almonds and macadamia nut oil, which supply monounsaturated fats that are slowly absorbed by your body. Such ingredients may help maintain ketone production without triggering rapid insulin spikes. These fats also form chylomicrons, which help release energy into your cells at a steady rate.
Chicory root fiber (inulin) is added as a prebiotic soluble fiber, which may delay stomach emptying, moderate glucose absorption, and support gut health. The makers included flaxseed for its alpha linolenic acid and lignans that may help lower inflammation and support lipid metabolism. Citrus fiber is added to the shake to support satiety by binding to water molecules and increasing thickness in the digestive tract, which might also help digestion.
Fasting Shake further contains a mix of 21+ nutrients, including vitamins C, A, E, and B-complex, alongside minerals like manganese, iodine, selenium, and copper. These nutrients could support mitochondrial energy metabolism, antioxidant activity, and hormonal balance during fasting. Extracts from vegetables, fruits, and mushrooms such as kale, broccoli, pumpkin, and shiitake mushrooms are also added to the formula. These provide phytonutrients and antioxidants that might help tackle the oxidative stress that may arise during longer fasting periods.
Fasting Bar can be consumed during the fasting window without disrupting your body’s fasting state. As per the official site, the product comes in boxes with 12 bars each, available in Coconut Macadamia, Nuts and Honey, and Chocolate Chip flavors. Across all three flavors, one bar (40g) contains 190 calories, 14g of total fat, 7–8g of dietary fiber, and 5–6g of protein. The manufacturer positions Fasting Bar as keto-friendly, soy-free, gluten-free, and dairy-free.
The nuts and seeds in the Fasting Bar provide steady energy release from fats and omega-3 fatty acids. For instance, macadamia nuts in the bar contain monounsaturated fats that could promote fatty acid oxidation and help your body remain in a fat-burning state. The makers included flaxseeds in the bar for its soluble fiber and alpha linolenic acid content, which may help reduce post-meal glucose rise and support ketone stability.
Pecans are also added to supply oleic acid and antioxidants, which may slow carbohydrate absorption and support digestion. Fasting Bar contains rosemary extract with compounds like carnosic acid and rosmarinic acid, which might help lower oxidative stress during fasting.
The makers further included sea salt in the bar to provide electrolytes such as sodium, which may help support fluid balance and nerve function during fasting.
Prolon claims that its programs and offerings are based on decades of fasting and nutrition research. Its approach draws on years of studies that explore how reduced calorie and protein intake may influence cellular stress responses, support autophagy, and influence pathways linked to healthy aging. Such a research-based longevity approach can give you a structured program shaped by tested scientific frameworks rather than guesswork.
Five-Day Fasting Mimicking Diet forms the core of the brand’s method, which is a structured meal program developed to trigger a fasting-like metabolic state while providing essential nourishment. As per the brand, one controlled clinical study in healthy adults showed that people who completed three monthly cycles of the five-day protocol observed changes in biomarkers like body weight, fat around the waistline, systolic blood pressure, and insulin-like growth factor 1 levels. The brand explains that these findings point to potential metabolic and cellular responses connected to the fasting-mimicking model.
Prolon claims to base its nutrition program on a proprietary Fasting Mimicking Diet system, developed through over twenty years of research led by Dr. Valter Longo at the USC Longevity Institute. The brand reports holding more than 200 global patents and applications that protect its formulations, macronutrient ratios, and fasting methodologies.
For example, one specific U.S. Patent 11,284,640 B2 describes the brand’s meal plans to support a fasting-like state while still providing nourishment. As per the documentation, the method reduces daily calories to less than half of the typical intake and limits protein and sugar consumption to support autophagy. This may position the brand’s fasting programs with a clearly defined and patented nutrition model.
The brand’s fasting mimicking program is built around a fixed five-day meal plan, which features about 1,100 calories on day 1 and between 700–800 calories on days 2 to 5.
As part of the plan, the brand offers 5 boxes, featuring plant-based soups, nut-based bars, snacks like olives, herbal teas, and supplements such as the L Drink and L Bar.
Everything is pre-portioned to help you maintain a fasting state while still giving basic nutrients, but the structure leaves no room for changes. It does not account for metrics like your age, body weight, activity level, metabolic rate, or dietary preferences, all of which may impact your fasting outcomes. For instance, if you have food sensitivities, the repeated use of nuts, legumes, or soy-based ingredients can make the plan harder to follow.
Unlike platforms that adjust meals through online assessments or biometric insights, Prolon does not allow changes to macronutrient ratios, portion sizes, or calorie levels. As a result, there is a chance that the program may not align with your caloric requirements, metabolic status, and fitness goals.
The brand’s FMD program has undergone studies from the USC Longevity Institute, and the available trials report benefits like better metabolic markers, lower inflammation, and fat loss. However, most of this research was conducted on healthy, middle-aged adults and a small group of people with mild metabolic concerns such as prediabetes.
Currently, there is limited scientific data on how the Prolon program works for younger adults under 25, older adults over 70, or those with chronic health conditions. Older adults may have different protein or micronutrient requirements that FMD programs may not fully support, while younger or active users may find the calorie intake too low for daily energy needs.
The fasting kits from the brand are standardized and pre-portioned. They do not account for the variances in metabolism, muscle mass, or hormonal differences that come with age. Most published studies also focus on short-term changes like weight shifts or blood sugar improvements after one or two cycles. There is no long-term research showing how repeated use affects nutrient balance, muscle health, or metabolic function across different age groups.
Because of the limited age diversity in the research, you may not know whether the program and formulations are compatible with your daily energy needs or nutritional demands.
DIY FMD, also known as Do-it-Yourself Fasting Mimicking Diet, provides a short-term and structured eating plan that entails controlled caloric intake and nutrient balance to keep your body in a fasting state while still providing basic nourishment. The DIY FMD is centered around the same scientific model as Prolon’s 5-Day Fasting Mimicking Program.
The DIY FMD plan focuses on widely available ingredients to support fasting. In most cases, the food choices include vegetable-based soups, light salads, and steamed/sautéed non-starchy vegetables like spinach, zucchini, mushrooms, and leafy greens. You may also consume small servings of almonds, walnuts, berries, broths, and olive oil.
The overall food pattern remains plant-based, low in protein, low in sugar, and rich in good fats and vegetables. A typical DIY FMD plan may start with around 1,100 calories on day 1 and drop to roughly 700 to 800 calories from days 2 to 5.
Meanwhile, Prolon’s Fasting Mimicking Program is positioned as a patented 5-day fasting plan kit, featuring five pre-portioned labeled boxes. These boxes contain plant-based soups, cold-pressed nut bars made with almonds and pecans, and supplements like multivitamins and amino acid blends. It also includes snacks like kale crackers and olives, caffeine-free herbal teas, and a fruity glycerol-based L-Drink. Instead of charting out meal plans and ingredients, you receive pre-portioned boxes labeled for each day.
In terms of goals and expected benefits, the DIY FMD plan intends to support fasting-linked processes such as cellular renewal, metabolic balance, gut support, and energy metabolism.
Prolon’s Fasting Mimicking Program also communicates similar outcomes, such as fat loss with muscle protection, improved eating habits, better energy, and better mental focus. However, the brand positions its programs and formulations around clinical research, proprietary nutrient design, and supplement-based support.
Support and guidance also differ between the versions. With the DIY FMD plans, you get no access to video tutorials, expert guidance, resources, and fitness advice, leaving you on your own to develop and implement the plan. On the other hand, Prolon’s FMD adds a more structured support system that includes daily tips, videos, education modules, and live expert-led group coaching. It may give the brand a more guided and interactive element, while the DIY approach stays focused on self-directed use.
Both the DIY FMD and Prolon’s FMD follow the same fasting-mimicking principle, yet they differ in execution. The DIY FMD prioritizes whole-food ingredients, simple preparation, and a naturally structured calorie progression. Meanwhile, Prolon delivers a clinically structured, pre-packaged system supported by supplements and guided coaching.
As part of evaluating Prolon, we examined verified user reviews on Trustpilot across 2025 to understand how customers experience the brand’s programs and services beyond the advertised benefits.
The brand holds a 4.2 out of 5 rating based on 9,500+ reviews shared on Trustpilot. Many users highlighted that the brand’s fasting program delivered noticeable results, often describing improved energy, focus, and reduced appetite by the end of the cycle. Some customers also valued the structured guidance provided through coaching calls, which helped them move through the program with more confidence.
At the same time, we noted recurring concerns that point to areas for improvement in the customer experience. Some reviewers expressed issues with website navigation and unclear product distinctions. A few users mentioned subscription-related complications, such as auto-renewals, overlapping plans, or complex cancellation pathways. Moreover, some users expressed mixed opinions about the taste of certain foods, particularly soups.
Our evaluation of the brand’s customer reviews indicates that the brand performs well in terms of product results and service responsiveness. However, it still faces steady criticism around online usability, subscription clarity, and ordering control.
To evaluate Prolon’s reputation, we looked at how the brand positions itself in the metabolic health and structured nutrition space. The brand positions its programs and formulations around a fasting-mimicking approach supported by scientific principles. It may help the brand maintain a clear and guided structure, which may provide a predictable fasting experience.
We also assessed the ratings held by the brand across independent review platforms. The brand is accredited by the Better Business Bureau (BBB) and holds an “A+” rating on the platform. Although the high rating may indicate compliance with structured fasting norms and ethical business practices, there are some complaints filed against the brand. These include concerns around unclear promotional pricing, trouble canceling subscriptions, delayed or missing shipments, and slow or inconsistent communication from customer service.
On TenereTeam, the brand maintains a 4.5 out of 5 rating based on 2000+ reviews. Many customers experienced reduced cravings, better satiety, and improved energy while using the brand’s fasting-mimicking programs. However, a few users found the food options repetitive, while others felt the products were expensive.
When combining the brand’s background with the ratings across BBB and TenereTeam platforms, the brand indicates credibility through its science-focused approach and user-reported benefits. However, the presence of unfavorable customer experiences may indicate areas of improvement in the brand’s operations and services.
Prolon positions itself around a structured fasting mimicking system (FMD), offering pre-portioned five-day meal kits, plant-based foods, and standardized formulations. The brand’s offerings follow its proprietary FMD framework model, which the makers claim is backed by years of research on nutrition science and longevity.
However, the fixed format and lack of customization can make the program less adaptable if you have specific dietary needs, sensitivities, or calorie requirements. Moreover, the available research backing FMD’s benefits is centered mostly on middle-aged adults, which means there is less clarity for younger, older, or clinically diverse groups who may respond differently. Thus, it becomes essential to look closely at your fasting goals, energy levels, and comfort with pre-portioned meal plans before committing to the program.
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