FAQs

Medically-Related ·
Trying to conceive?
Prolon has not been specifically evaluated for its impact on fertility or conception. While we do not have dedicated research on Prolon in relation to conception, it's important to note that improving cardiometabolic health can positively influence fertility. Prolon has...
Medically-Related ·
Why are enemas and colon cleanses not recommended during the program?
There have not been any documented benefits of doing a colon cleanse during a fast and, in fact, colon cleanses have been demonstrated to increase the loss of electrolytes and potentially increase the risk of dehydration, which may be unsafe,...
Medically-Related ·
Do we have a recommended ketone range during ProLon?
We do not have a recommended ketone range during ProLon mainly because although ketone measurement can indicate physiological fasting, it is not a complete indication of fasting, and is not an indicator of the molecular (cellular) fasting which ProLon also...
Medically-Related ·
Will I experience acid reflux?
Acid reflux was not a commonly reported occurrence during the clinical trials for ProLon, but different people experience reflux for different reasons, and we cannot give medical advice or state anything about acid reflux and your potential experience with certainty....
Medically-Related ·
Do I have to wait to start ProLon after completing a round of antibiotics?
The impact of ProLon on antibiotics (or antibiotics on ProLon) has not been evaluated, but there do not appear to be any concerns with beginning ProLon 10-15 days after you have completed your course of antibiotics and symptoms have completely...
Medically-Related ·
What types of blood tests can be done to measure metabolic health?
If you’re only planning to do one cycle of ProLon, you will likely feel (and be able to measure) many of the benefits we advocate such as losing weight while on the fast, improving your relationship with food, feeling more...
Medically-Related ·
What do I do if I’m having trouble sleeping during the program (due to hunger)?
The L-bar may be consumed later in the day and the dinner soup can be consumed at a later time. Some people elect to drink a large glass of water to help them feel fuller before bedtime.
Medically-Related ·
Will ProLon impact my sleep?
Most of the data regarding the effect of fasting on sleep is anecdotal. However, in a survey of ProLon users, among healthy volunteers surveyed and reporting a difference in quality of sleep after using ProLon for the first time, the...
Medically-Related ·
Does growth hormone spike after the 5 days of ProLon?
Some studies have demonstrated a significant increase in growth hormone during a prolonged water fast (typically in days 3 to 5), but the clinical studies on ProLon did not report growth hormone levels, so we can’t definitively say if the...
Medically-Related ·
What if I get a headache? Can I take acetaminophen, ibuprofen, and/or aspirin?
Headaches can be from reduced caffeine intake during the ProLon program. To prevent this, we suggest slowly reducing your caffeine beginning a few days before you start your ProLon. Headaches can also be from the fasting state, thought to be...
Medically-Related ·
Should routine intake of dietary supplements and prescribed medications be stopped during the ProLon dietary program?
You should not stop taking any prescription medications, and should not stop using any over the counter (OTC) medications or supplements your healthcare provider has told you to use without discussing it with them first. For this reason, if you...
Medically-Related ·
Can I use ProLon with an existing health condition or disease?
If you have a medical condition, talk to your healthcare provider to determine your suitability for ProLon. If you do not have a provider, you can use our Healthcare Provider Locator to see if we have a provider near you.
Medically-Related ·
Do you ship ProLon outside of the US?
In addition to US shipping, we ship to Canada: prolonfast.ca, certain countries in the Europe: prolon.eu, ProLon in Australia: prolon.com.au and in the UAE: prolon.ae. We don't ship to any countries outside of these listed countries at the moment.
Medically-Related ·
Can I take an Epsom salt bath?
An Epsom salt bath is ok, however the temperature must be lukewarm, as hot baths during ProLon can cause a dangerous drop in blood pressure
Medically-Related ·
ProLon and over the counter (OTC) Antihistamines
This has not been formally studied, but non-drowsy allergy medications do not appear to interact with the fasting pathways, but as with all medication use, we recommend discussing any specific concerns with your healthcare provider.
Medically-Related ·
Can I get an enema during the program?
The impact of enemas was not evaluated during ProLon clinical trials. While we cannot provide medical advice, and you should seek the advice of a healthcare provider, we do not recommend getting an enema during or immediately after ProLon.
Medically-Related ·
What can I do to Help Bowel Movements? Can I use Stool Softeners (like Senna or Smooth Move Tea) while on the program?
We have not directly studied the use of stool softeners, laxatives, or pro-motility agents with ProLon. We cannot give any medical advice, and recommend discussing all medication changes or concerns with your healthcare provider. We encourage people to maintain adequate...
Medically-Related ·
Can I schedule my ProLon cycle the week of an Allergy Test?
Please talk to your healthcare provider about allergy tests and when to schedule a ProLon cycle. We have not evaluated the impact of ProLon on allergy testing.
Medically-Related ·
Do my bowels change while on the program?
ProLon appears to affect each person a bit differently. Most people will not experience any significant or lasting changes in their bowel habits during or after ProLon. Indeed, no big changes in bowel habits were observed during clinical trials. However,...
Medically-Related ·
I feel like I have the flu after completing ProLon, is that normal?
Mild fatigue, headaches, and muscle aches are a normal part of fasting for many people (some call it keto-flu), especially the first time they complete a prolonged fast. However, symptoms generally resolve on the transition day. Please discuss any concerns...
Medically-Related ·
Can I use ProLon with an existing health condition or disease?
If you have a medical condition, talk to your healthcare provider to determine your suitability for ProLon. If you do not have a provider, you can use our Healthcare Provider Locator to see if we have a provider near you.