Soil-Based Organisms: What’s the Dirt on these Probiotics?


Soil-Based Organisms (SBO’s) or Hemostatic Soil Organism (HSO) are a form of probiotics that can be obtained when one has eaten:

  • Soil
  • Food fermented with SBO’s, or
  • Soil-covered vegetables and fruits.

SBO’s are bacteria that are naturally found in soil. There was a time in the not too distant past that SBOs were present in abundance in our food chain. Now with modern farming techniques, most natural food grown in soil is sterilized.

There are over a hundred strains and species of SBOs. The most common strain comes from the Bacillus genus.

One of the main distinctions between SBO’s and Lactobacillus and Bifidobacterium strains is that SBO’s are spore forming. Spore forming means that it is able to replicate its DNA and then pinch its plasma membranes off between the two sets of chromosomes, to create an external spore.

SBO’s have some unique characteristics from other probiotic strains:

  • SBO’s are resistant to the harsh acid environment of the stomach
  • SBOs reach the small and large intestine intact and complete due to the fact that they are very stable and do not require any coatings for protection.

The scientific research on SBO’s is very limited. There is virtually no scientific evidence (not found at time of publication) regarding the safety of SBOs.

In the Bittner et. Al. studies, the authors used Prescript-Assist SBO and their end result was that the three main symptoms of IBS: nausea, indigestion/flatulence and colitis pain were all reduced by a statistically significant amount in the probiotic group during the time of the study.

There appears to be a debate in the health industry regarding SBO’s. The pro-SBO’s group consists of the main manufactures and distributors of the SBO probiotic formulations. There are four main manufactures of SBO probiotics:

There are also a number of anti-SBO advocates. They have written articles regarding their position. Three of these articles follow:

Following is list of the strains and species of SBO’s (and other bacterial genus) in the four main SBO probiotic formulas:

Prescript-Assist: (29 strains)

  • Arthrobacter agilis,
  • Arthrobacter citreus,
  • Arthrobacter globiformis,
  • Arthrobacter luteus,
  • Arthrobacter simplex,
  • Acinetobacter calcoaceticus,
  • Azotobacter chroococcum,
  • Azotobacter paspali,
  • Azospirillum brasiliense,
  • Azospirillum lipoferum,
  • Bacillus brevis,
  • Bacillus marcerans,
  • Bacillus pumilus,
  • Bacillus polymyxa,
  • Bacillus subtilis,
  • Bacteroides lipolyticum,
  • Bacteriodes succinogenes,
  • Brevibacterium lipolyticum,
  • Brevibacterium stationis,
  • Kurthia zopfii,
  • Myrothecium verrucaria,
  • Pseudomonas calcis,
  • Pseudomonas dentrificans,
  • Pseudomonas fluorescens,
  • Pseudomonas glathei,
  • Phanerochaete chrysosporium,
  • Streptomyces fradiae,
  • Streptomyces cellulosae,
  • Streptomyces griseoflavus

Primal Defense (Garden of Life – Homeostatic® Soil Organisms) (12 strains)

(Note: Only 1 strain is considered a SBO: Bacillus subtilli. The other 11 strains are from the genus Lactobacillus and the Bifidobacterium genus).

  • Bacillus subtilis
  • Bifidobacterium bifidum
  • Bifidobacterium breve
  • Bifidobacterium lactis
  • Bifidobacterium longum
  • Lactobacillus acidophilus
  • Lactobacillus brevis
  • Lactobacillus casei
  • Lactobacillus paracasei
  • Lactobacillus plantarum
  • Lactobacillus rhamnosus
  • Lactobacillus salivarius

Megasporebiotic: (5 strains)

  • Bacillus Clausii
  • Bacillus coagulans
  • Bacillus indicus HU36
  • Bacillus lichenformis
  • Bacillus subtilis HU58

BioKult: (14 strains)

(Note: Only 1 strain is considered a SBO: Bacillus subtilli PXN 21).

  • Bacillus subtilis PXN 21
  • Bifidobacterium bifidum PXN 23
  • Bifidobacterium breve PXN 25
  • Bifidobacterium infantis PXN 27
  • Bifidobacterium longum PXN 30
  • Lactobacillus acidophilus PXN 35
  • Lactobacillus delbrueckii ssp. bulgaricus PXN 39
  • Lactobacillus casei PXN 37
  • Lactobacillus plantarum PXN 47
  • Lactobacillus rhamnosus PXN 54
  • Lactobacillus helveticus PXN 45
  • Lactobacillus salivarius PXN 57
  • Lactococcus lactis ssp. lactis PXN 63
  • Streptococcus thermophilus PXN 66

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