FAQs

quality-and-form ·
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...
safety-precautions ·
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.
safety-precautions ·
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.
clinical-trials ·
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...
clinical-trials ·
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...
quality-and-form ·
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...
quality-and-form ·
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...
fasting-with-prolon-general-information ·
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....
fasting-with-prolon-general-information ·
Can I exercise during and/or after fasting? How should I ease back into my exercise routine?
While exercise can help use up available blood glucose and move a person into a ketogenic, fasting state, vigorous exercise can stress the body and we do not recommend intense exercise during ProLon. So, while fasting, keep your activity light...
fasting-with-prolon-general-information ·
Why do you instruct people to avoid caffeine during ProLon?
Caffeine mildly stimulates the nutrient sensing pathway called the PKA pathway (as well as some other pathways) that ProLon down-regulates. For this reason, it is best to avoid caffeine during the diet, although you may have up to 140mg of...
fasting-with-prolon-general-information ·
Why should I not use tobacco products or other addictive substances while on the program?
Tobacco, vaping, and other addictive substances have not been studied as part of the ProLon program, but we recommend against their use together with ProLon.
fasting-with-prolon-general-information ·
Do you have any advice about eating ProLon® food?
You bet! Take extra time to enjoy your food. Eat slowly. Enjoy each spoonful of soup. Savor the flavor and texture of every olive and cracker. Doing this program is a great opportunity to reconnect with your senses of smell...
fasting-with-prolon-general-information ·
Can I fly during a ProLon cycle?
There are no contraindications to flying during use of ProLon, but you may have challenges if you need to eat on a long flight because the soups, the primary components of each day’s meals, are designed to be prepared over...
before-the-prolon-5-day-fast ·
Can I start Day 1 of ProLon® the night before with one of the dinner soups?
You may have a light dinner the night before starting ProLon, however we recommend that you use the food provided according to the instructions, starting with breakfast on the morning of Day 1 to ensure that you get all of...
eating-during-the-prolon-5-day-fast ·
What if I get really hungry as I'm doing ProLon®?
Keep in mind that there’s a difference between cravings and hunger. Cravings are normal while doing ProLon, and generally pass within a short period of time. To address cravings, keep yourself distracted, and drink sparkling water (unflavored, unsweetened) and/or non-caffeinated,...
eating-during-the-prolon-5-day-fast ·
Can I eat the day’s food at different times?
According to the trial design, the order and timing in which you eat each day’s items does not impact the outcome. You can consume the entire day’s contents in a single sitting, though we do not recommend doing so as...
eating-during-the-prolon-5-day-fast ·
Can I drink electrolyte beverages while on ProLon®?
If you really feel the need, you can have a zero-calorie electrolyte beverage as long as it doesn't contain: additional additives like preservatives and colors; nutrients like carbs, fats, or protein; or any additional natural or artificial flavors.
eating-during-the-prolon-5-day-fast ·
Can I replace the L-Bar with a Fast Bar or other types of nuts?
Due to the carefully studied, carefully formulated macro- and micro-nutrient ratio in the L-Bar, there is no substitute which meets its exact profile. Although Fast Bar is very similar to ProLon’ s Nut L-Bars, there is a slight difference in size,...
about-multiple-prolon-cycles ·
What if I can’t do a ProLon cycle exactly one month apart?
Participants in our clinical trial all maintained as close to 25 days from the completion of one cycle to the beginning of the next, so we cannot say exactly what impact delaying or starting cycles early might have. In general,...
after-the-prolon-5-day-fast ·
What should I eat after my ProLon cycle?
You can refer to the Transition Day Meal Plan, but in short, we advise you to keep your meals light and small. Start with liquid foods, like soups and fruit juices, followed by things like rice, pasta and small portions...
after-the-prolon-5-day-fast ·
Should I do a day of water fasting after completing ProLon®?
We do not recommend doing any additional water fasting after completing ProLon, as this has not been tested in any of our studies and may be unsafe in certain people. We have tested the ProLon program extensively for safety and...