FAQs
What is the difference between ProLon and water-only fasts? What are the benefits of doing ProLon® instead of a water-only fast?
The main difference between ProLon and longer fasts is that ProLon provides nutrition during the fast to decrease the risks of side effects and loss of lean body mass. While some people can tolerate fasts of longer than 5 days, the 5-day ProLon program has been designed to maximize safety and tolerability. Thus, we do not recommend undergoing a prolonged fast greater than a few days without direct supervision by an experienced healthcare provider. In 2019, we conducted a safety survey of people who completed three or more rounds of... Read more...
Why should I do ProLon® instead of my own version of a fasting mimicking diet?
ProLon® is supported by over 20 years of research and development, including clinical trials. We strongly advise against DIY fasting mimicking diets, which may not include the proper macro- and/or micro-nutrients, may not effectively put your body into a fasting state, and may pose safety issues. Read more...
Can I use my ProLon kit or any of the contents after the expiration date?
Similar to other foods, consuming our products after the best before date is not recommended. Expiration (or best before) dates are set to ensure consumers experience our products closest to how they were formulated and designed. Some ingredients, such as vitamins, naturally degrade over time. That is why we make efforts to deliver quality products in a timely fashion and recommend to our products be consumed shortly after being received. Read more...
How should I store my ProLon?
L-Nutra products, including ProLon, are shelf-stable and packaged to protect against normal and seasonal temperature fluctuations. They should be stored in a cool, dry place, out of direct sunlight, in their original packaging. They do not need to be refrigerated while in their packaging, but can be if exposed to hot and/or humid weather. Read more...
What kind of plastic is used in the sports bottle, and L-Drink bottle?
Food grade PET is used in the ProLon sports and L-Drink bottles which come in the ProLon kit. Food grade means the plastic is safe for food contact. PET is commonly used in soda bottles, salad dressing bottles, and other types of food packages. PET does not contain BPA. Read more...
Do side effects decrease with further ProLon cycles?
In trials where participants did 3 consecutive monthly cycles of ProLon, it was reported that fasting effects such as hunger, headache and fatigue were both less common and less severe with each successive cycle of ProLon. Read more...
Can someone over 70 years old do the program?
Not without direct evaluation and supervision by a healthcare provider. You should consult with your own healthcare provider, or use a telemedicine provider to discuss your specific situation. Read more...
What scientific data is there to support ProLon ingredients, formulation, and use?
The proprietary dietary formulation for ProLon is based on over 20 years of scientific research, including preclinical (animal) and clinical trials. Many studies were conducted to develop the exact micro- and macro-nutrient ratio required to optimize nourishment but mimic fasting and ensure users would enter and stay in a fasting state while using ProLon. There are published clinical trials which support ProLon. Read more...
Can you send me a copy of the clinical trial(s)?
If you would like to discuss our clinical trials, you can contact our customer service department to connect to a Medical Science Liaison (MSL). The MSL can explain the context of the studies and answer additional questions you may have. We can send a copy of our studies to those who ask. MSLs can also discuss other scientific literature, but may not be able to provide copies of other studies due to copyright issues. Read more...
How does L-Nutra track the quality of ProLon®?
The quality of our products, and the safety of our valued customers, are our priorities. We comply with all food safety regulations, including current Good Manufacturing Practices (cGMPs), which require rigorous testing and manufacturing controls to ensure quality. We also have food safety programs for each edible component, and follow-up on any customer complaints, issues, or concerns. Read more...
Why are the foods in ProLon nut-based bars, kale crackers, soups, etc.? What is in the nut-based bars?
The overall composition of ProLon is scientifically designed to provide nutrition to the body without triggering the nutrient sensing pathways. Additionally, each individual food used in the ProLon kit is specially selected for its health benefits. The L-Bar has honey and unsweetened coconut for sweetness, but it is made primarily of nuts which provide good fats. The good nut fats also slow the absorption of the sugar, to keep the glycemic index of the bar low. Read more...
When should I start ProLon®?
That depends on your work schedule, home life and personal preferences. Some people find that starting on a Monday and finishing on a Friday is best as their work distracts them and gives them something to focus on besides food. Other people like starting the program in the middle of the week and finishing on a Sunday night. There’s no right or wrong answer here. You may want to keep in mind that most people find days two and three to be more challenging than days four and five, so... Read more...