ClearFast and CF Nutrition
Frequently Asked Questions | FAQs

General Questions

You can check out our Resources page for more information! 

All ClearFast products can be found and purchased through our website. We also offer our CF(Preop)® on Amazon.

Patients: If you are a patient who purchased ClearFast on our website, you can return your product within 30 days, no questions asked. Email support@drinkcf.com to initiate a return of your order.


Medical Professionals: Please see specific RGA between your facility and ClearFast. 


International Orders: International Orders can be cancelled with no penalty up until the time of product shipment pickup. Once the freight has been picked up, it cannot be returned except in the event of product arriving damaged at its destination. Pictures of the damaged product and a completely filled-out claim form must be submitted within 5 US business days of product receipt. 

CF(Preop)® and CF(Protein)® do not need to be refrigerated prior to being opened but should be after the safety seal is broken. Both products should be consumed by the expiration date printed on the bottle.

Note that CF products are all-natural; if oxygen gets into the bottle seal, it can create mold.


CF(Preop)® is ideally formulated for surgical patients who want to improve recovery after surgery. It uses 6 essential nutrients (complex carbohydrates, electrolytes, Vitamin A, Selenium, Zinc, L-citrulline) to nourish and hydrate the body.

You should consume one bottle of CF(Preop)® the night before surgery and another bottle up to 2 hours prior to surgery. You can also consume another bottle after your procedure unless directed by your physician to not consume any food or drink after surgery.

CF(Preop)® is ideal for consumption after surgery for patients who cannot or do not want to consume solid foods. If your doctor has directed you to not consume solid foods after surgery, please consult with him/her about how best to use CF(Preop)® as a meal replacement or supplement.

If you are preparing for and/or recovering from surgery, CF(Preop)® can help you by providing the clear liquid nutrition and hydration that is key to a better recovery. It is ideal for healthy people undergoing both scheduled and/or elective surgery, or invasive diagnostic procedures performed in both hospitals and outpatient facilities.

CF(Preop)® is specially formulated for patients who are undergoing general anesthesia or IV sedation, for all surgical procedures from orthopedic to cardiac… from gynecologic to neurologic. It is also appropriate for patients having colonoscopies, oral, and cosmetic surgeries plus cardiac catheterizations, etc.

Yes. Because each surgery and patient is different, you should always consult with your doctor to fully understand your preoperative needs and options.

Because you can’t have solid foods, fats, proteins, or colored dyes in your system during surgery.

So then why CF(Preop)® safe to drink before surgery?

Because you can have complex carb rich liquids up to 2 hours before surgery per the American Society of Anesthesiologists® fasting guidelines.

Yes, CF(Preop)® is safe to be consumed in the non-surgical setting. It contains the complex carbohydrates, electrolytes, amino acids, vitamins, and minerals that are key to proper nourishment.

Yes, CF(Preop)® can be consumed by children under the supervision of their doctors and parent/guardians. It can be consumed both before and after surgery.

For children weighing under 50 kilograms or 110 pounds, we recommend dividing the full 12 ounce bottle into 3 servings (4 ounces each.) Children should consume the first two servings at 4 and at 3 hours before surgery and the last serving 2 hours prior to surgery in order to ensure proper absorption before the start of anesthesia.

A 40-50 kg adult could have the same ingestion schedule as a similarly sized child, that is, three servings of 4 ounces each at 4, 3 and 2 hours prior to surgery.

Yes, women in labor can drink CF(Preop)® under the supervision of their doctor. If you are pregnant and scheduled for a cesarean section, you may be allowed to consume CF(Preop)® up to 2-3 hours prior to your scheduled delivery.

CF(Preop)® is certified Vegan and certified Kosher. It is also gluten-free. 

CF(Preop)® is not known to react adversely with any medications.

Yes, CF(Preop)® is safe for diabetics under the care of their physician. Always consult your physician about what is the appropriate timing for and amount of CF(Preop)® that you should be drinking, especially prior to surgery.

Your doctor can find the recommended CF(Preop)® protocol for diabetic patients here.


CF(Protein)® is a delicious, natural plant protein drink made to get you strong in the weeks leading up to surgery.

It is made with Filtered Water, Maltodextrin, Mango Juice Concentrate, Yellow Pea Protein, Lemon Juice Concentrate, Coconut Water Concentrate, Chia Seed Oil, L-citrulline, Natural Flavors, Turmeric, Salt, Stevia, Vitamin Extract from Fruits and Vegetables.

Having surgery or going through life malnourished can cause serious complications. CF(Protein)® is a delicious, natural plant protein drink made to get you strong in the weeks leading up to surgery. And, it’s ideal for your recovery days after surgery.

CF(Protein)® was not designed as a meal replacement. But you can supplement a healthy diet with CF(Protein)® in the weeks leading up to and following surgery to help you build a solid foundation for your upcoming procedure.

Turmeric, a natural and powerful anti-inflammatory and anti-oxidant, gives CF(Protein)® its vibrant color.