FC-Cidal and Dysbiocide

A reader mentioned FC-Cidal and Dysbiocide in a message. They were prescribed by a well known CFS physician. As usual, I am curious to know about such.


FC-Cidal is a product produced by Biotics Research Corporation. It contains the following:

  • French Tarragon (Artemisia dracunculus) (leaf),
    • ” These compounds did not affect the growth of test lactic acid-producing bacteria (Bifidobacterium adolescentis, Bif. breve, Lactobacillus acidophilus and Lact. casei) and Escherichia coli, whereas weak growth inhibition towards Bif. bifidum was observed.” [2003]
  • Indian Tinospora (Tinospora cordifolia) (stem & root),
  • Horsetail (Equisetum arvense) (whole herb),
  • Thyme (Thymus vulgaris) (leaf),
  • Pau D’ Arco (Tabebuia impetiginosa) (inner bark),
    • ” no adverse effects were observed on the growth of Bifidobacterium adolescentis, Bifidobacterium bifidum, Bifidobacterium infantis, Lactobacillus acidophilus, and Lactobacillus casei at 1000 microg/disk.” [2005]
  • Stinging Nettle Extract (Urtica dioica) (root),
  • Olive (Olea europaea) (leaf).
    • “Six bacterial strains (Lactobacillus plantarum 6907, Lactobacillus paracasei 9192, Lactobacillus casei, Bifidobacterium lactis BO, Enterococcus faecium 32, Lactobacillus LAFTI 10) were tested… on Olive Oil and grew well [2012]
    • ” The results obtained using a selected olive sample demonstrated that bifidobacteria and one strain of L. rhamnosus (Lactobacillus GG) showed a good survival rate, with a recovery of about 10(6) CFU g(-1) after 30 days. The Lactobacillus GG population remained unvaried until the end of the experiment, while a slight decline (to about 10(5) CFU g(-1)) was observed for bifidobacteria. High viability, with more than 10(7) CFU g(-1), was observed throughout the 3-month experiment for L. paracasei IMPC2.1. ” [2005]

Their product literature is here.


Dysbiocide is another produce produced by Biotics Research Corporation. It contains the following:

  • Dill (Anethum graveolens) (seed),
    • reduces lactic acid bacteria Lactobacterium buchneri [1975]
  • Stemona (Stemona sessilifolia) (root) (powder and extract),
  • Wormwood (Artemisia absinthium) (shoot & leaf) (extract),
  • Java Brucea (Brucea javanica) (fruit) (powder & extract),
  • Chinese Pulsatilla (Pulsatilla chinensis) (rhizome) (powder & extract),
  • Jamaic a Quassia (Picrasma excelsa) (bark) (extract),
  • Cutch Tree (Acacia catechu) (heartwood & bark) (powder & extract),
    •  inhibited …. L. acidophilus. [2016]
  • Hedyotis (Hedyotis diffusa) (aerial part) (powder & extract),
  • Yarrow (Achillea millefolium) (leaf & flower) (extract).
    • Reduces Lactobacillus rhamnosus [2014]


I dislike combinations because they usually contain good and bad items. Second, it is hard to rotate when you are “taking the kitchen sink”.

I did a spot check and annotated the items above. Dysbiocide appears to be contra-productive for our goals. FC-Cidal has two which do not effect lactobacillus, bifidobacteria and do impact other organism, and one that could be inferred to encourage the growth of the same.

Bottom Line

I would suggest rotating between:

  • French Tarragon (Artemisia dracunculus) (leaf) .. or/and other Artemisia
  • Pau D’ Arco (Tabebuia impetiginosa)
  • Olive (Olea europaea) (leaf).

Instead of mixture containing herbs and spices that we do not know what their impact may be.