The liver of animals and fish contains high levels of vitamin A and iron, both are precious in fighting cancer and anemia.

Calf Liver Juice

In his original therapy Dr. Gerson prescribed calf liver juice. The calf liver juice was mixed with carrot juice and taken 3 times daily. However, this protocol was changed with the advent of contamination of the animal’s liver by campylobacter infections. Then a safer version was created in the form of liver extract injections. During our first years of practice, we obtained liver extract from Mexico. Currently this source is banned in the US for health and safety reasons due to mad cow disease.


In an effort to keep the therapy as close to the original protocol as possible, we used other sources of liver extract that were recommended by reputable physicians for other chronic conditions, in particular chronic fatigue. At this time, we use a brand of liver extract called Nexavir. Nexavir is a porcine liver extract from New Zealand. A prescription is required to purchase the injectable form of Nexavir. The only company that manufactures Nexavir is a Texan company called Nexco Pharma. A Texas pharmacy called Village Compounding produces Nexavir compounded as a transdermal gel. A prescription is also required for this Nexavir gel. Nexavir should not be confused with ‘Nexavar,’ a drug that treats certain cancers.

Nexavir is similar to Hepapressin or Kutapressin that was used for 12 years by doctors Enlander and Teitelbaum in the treatment of chronic fatigue syndrome.

How To Take Nexavir?

Nexavir is administered by intramuscular injection with the vitamin B12 (methylcobalamin). We recommend a dosage of 2.7 ml administered daily for 6 months.

Liver Extract and Vitamin B 12 (methylcobalamin) are drawn up together in one syringe and injected daily.

Liver Extract and Vitamin B 12 (methylcobalamin) are drawn up together in one syringe and injected daily.

Negatives Of Taking Nexavir

The main negative of taking Nexavir is the cost. At 2.7 ml a day (the standard dose), Nexavir will cost approximately US $450 a month. As the minimum recommended treatment period of Nexavir is 6 months (barring side effects), the total cost of a Nexavir trial is approximately US $2,700. This is not including the cost of shipping, syringes or needles. Some insurance companies may partially cover the cost of Nexavir.

Dr. Derek Enlander

Dr. Enlander used Kutapressin for approximately 12 years until Schwarz Pharma ceased producing it. He then originally tried Nexavir on his patients however due to the preservatives within Nexavir, he trialed his patients on Hepapressin. Hepapressin is similar to Nexavir however it is an Argentinean bovine liver extract, as opposed to porcine liver extract. Dr. Enlander recommends that his patients take other substances in tandem with Hepapressin to increase its effectiveness. 67% of his patients have shown an improvement as a consequence of weekly Hepapressin injections in combination with other treatments. Recently, Dr. Enlander commenced a study alongside Dr. De Meirleir that examined alternative ways to administer Nexavir/Hepapressin.

Dr. Jacob Teitelbaum

Dr. Teitelbaum has noticed a dramatic improvement in some of his chronic fatigue syndrome (CFS) patients as a consequence of taking Nexavir regularly. He has found that those patients who took Nexavir three times a week didn’t gain much benefit, as daily injections are a necessity. Dr. Teitelbaum has also observed that some of his patients’ CFS symptoms returned after discontinuing Nexavir.