The science of the microbiome, in an easy form.
Short, free e-books about the microbiome, fermentation and the gut–brain axis — written on the basis of scientific literature.
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E-book #1
Does your gut dislike holidays?
Why a change of place, diet and daily rhythm affects the microbiota, and how to support the digestive system during a holiday.
Danuta Kruszewska · Thesybin
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E-book #2
Postbiotics and menopause
Menopause is a natural stage in a woman’s life. This e-book shows what we know today about the links between the microbiome, postbiotics and this period of a woman’s life — and what science has not yet confirmed.
Danuta Kruszewska, President of the Management Board of Thesybin Labs PSA
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E-book #3
The gut and neurodiversity
Children with ADHD and ASD are among the most difficult research populations. This e-book shows why science keeps coming back to the gut and how the gut–brain axis is studied in the context of ADHD and ASD. It also shows why precision is more important than biological fashion.
[FOR LEGAL DECISION: variant A or B]
Coming soon — more e-books (2026/27)
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#4 — The gut and immunity
(October 2026)
Autumn is a time when immunity is put to the test. This e-book shows how the gut microbiota is linked with the immune system and what we know today about the role of postbiotics in this context.
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#5 — The gut–brain axis
(November 2026)
Most of the body’s serotonin is made outside the central nervous system, and the digestive tract plays an important role in its production. This e-book shows how the microbiota is linked with mood and concentration, and what we know today about the role of postbiotics in this area.
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#6 — Diet and the microbiota
(December 2026)
Diet has a big effect on the composition and diversity of the microbiota. This e-book suggests what to eat to support the gut and which fermented products are worth adding to your diet.
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#7 — New year, new gut
(January 2027, optional)
After the holiday season the gut often needs support. This e-book suggests how to return to a regular eating rhythm and daily habits.