One preparation · what people take it for

For the winters you would rather not lose to colds

Almost everyone who writes to us mentions it, even when they came for something else: they stopped catching things. Or they caught them and were over them in two days. Bacillus F is one preparation, not a range. Same drops, whatever you take them for. This page is what people said when immunity was the reason.

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Bacillus F sublingual applicator pen on a marble kitchen counter beside a glass of water, an apple and a lemon, morning sun through the window. longevity postbiotic supplement by Bacillus F OÜ, Tallinn, Estonia.

What people said

  • “While taking it, I have never had a cold. Before, even before COVID, I had a viral infection with a fever once every six months.”
    Daniel M., 48 · Since December 2022
  • “I have more energy. Viral diseases bypass me. Blood pressure has returned to normal. Looking at me, my husband started taking it too.”
    Emma C., 40 · Since August 2023
  • “Before, we were sick every spring and autumn: me, my wife, our daughter. The spring passed without any illness. Autumn is going smoothly. My sleep has definitely improved.”
    Lukas F., 45 · Since February 2024
  • “I haven’t been sick once in a year. No respiratory infections, not even a runny nose. Never in my 61 years have I been so happy.”
    Margaret D., 61 · Since February 2024

Individual experiences with a dietary supplement. Not medical advice; not evaluated by the FDA; not intended to diagnose, treat, cure or prevent any disease.

Petri dish photographed from above: a single white Bacillus F colony with frilled, snowflake-like edges on clear agar, grown from the Russian permafrost isolate

The part that is actually documented

The immune activity of the strain is what its patent family was granted for (WO2012060729 and five national patents), and the 2012 paper in Probiotics and Antimicrobial Proteins tested a permafrost isolate against Salmonella infection in mice. That is animal and cell work, not a human trial, and we’d rather you knew.

What to expect, and when

The immune reports are the slowest to arrive and the most consistent once they do. People usually notice it a season later: “I realised I had not been ill all winter.”

Things people ask about this

No. It is a food supplement. Not a treatment, not a prevention, not a substitute for either.

One reviewer gives it to his family. We don’t recommend it for children and we don’t ship it for them. Adults only in the request.

No. It is what the bacterium produces, cold-processed. Nothing in the applicator is alive. Keep it in the freezer until you open it, then in the fridge.

Other reasons people come to us

Bacillus F is one preparation, not a range. Same drops, whatever you take them for.

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