Probiotics are Useless, Saccharomyces Boulardii as SIBO Cure
In psoriasis there is an overgrowth of bacteria and fungi in small intestine caused by low bile flow, low pancreatic and villi enzymes that leave the starches undigested.
The fact is that antibiotic therapy is not successful, too. Mostly when taken for short period of time like days or weeks. That fact establishes the bacteria as not the number one cause of psoriasis. Or maybe I should say – easily reachable bacteria – are not the top cause of psoriasis.
Bacteria are usually covered in biofilm in the small intestine or in the tissues and successfully hidden in root canal teeth.
Cure Small Intestinal Bacterial Overgrowth with more bacteria???
Why would anybody wanted to take another billions of bacteria in capsules – probiotics?
There is no known research that would concluded high cure rate of psoriasis with some probiotic bacteria.
Then why all those websites, blogs and “experts” recommend probiotics – lactic acid bacteria or those expensive soil based – for treatment of small intestinal bacterial overgrowth? Do they even know how the body works?
Small intestine should be clean – without bacteria – or at least almost clean with bacteria content of 1 000 bacteria per milliliter (CFU/ml). That is actually pretty clean environment!
So why would you take billions of bacteria in capsule and even support their growth with apple pectin or some other fiber?
One probiotic capsule of 10 billion bacteria (CFU) is equivalent of maximal bacterial count that should be in 10 000 liters of fluid from small intestine. Human small intestine contains about 45 – 319 ml of fluid in fasting state and 20 – 156 ml one hour after meal. 
That means one capsule of 10 billion bacteria contains about 50 000 times more bacteria than there should be in small intestine.
Probiotic bacteria should live only in colon
The probiotics you taking are not intended for small intestine. They should not colonize the small intestine at all. Their destination is colon.
The problem of small intestine in SIBO is low bile flow and too much bacteria. But not just bacteria – fungal growth – is the consequence of low stomach acid, low bile flow and low enzymatic output of pancreas and intestinal villi.
Fungus can be defeated with another fungus – Saccharomyces boulardii
This fungal specie is popular for dysbiosis because it has very low pathogenicity and is not invasive. The point is that Saccharomyces boulardii fungus will compete with bacteria and mostly other fungi in the small intestine! 
The other fungi may be very dangerous to human health because they may produce various toxins like aflatoxin, ochratoxin, fumonisin,… that disrupt the hormonal system, damages the neurons and are carcinogenic.
Keep in mind that you may be having the die-off or detox symptoms when taking Saccharomyces boulardii. Every supplemental fungus as well as probiotic bacteria may cause problems in some cases so any serious bad reactions should be communicated with professional!
How can be SIBO cured
Small intestine dysbiosis should be addressed with choleretic/cholagogue supplements like bile acids or artichoke. Restoring the proper bile flow is essential in order to clear up and heal the small intestine and cool off the inflammation.
Saccharomyces boulardii may greatly help with this because it inhibits the growth of bacteria and other fungi in the small intestine.
Probiotic bacteria in capsules in many cases are surely not the best