This is how it all began,

I have a 100% rye starter for about a year now. I used a spoon that had some other dough on it, that dough was from a bag of flour that had mentioned at the bottom of the packaging, it had some leavening improvers. Assuming that's commercial yeast?

Either way, will this commercial yeast, should it be in my starter, wreak havoc on my natural wild starter?

Will the wild strands kill it off?

  • 10
    Was the dough a yeast dough? Leavening improvers aren't yeast.
    – GdD
    Jun 15, 2022 at 18:13
  • It wasn't...in fact it made no mention...just at the very bottom about these leavening agents.
    – Pinch
    Jun 15, 2022 at 19:44

2 Answers 2


Not withstanding @GdD's comment above, even if you just had a small amount of yeast on a spoon, I would guess that, after a year (and it doesn't take nearly that long), the bacteria and yeast you've cultured in your starter have a strong foothold. Dominant strains typically win. After all, that is really the idea behind a sourdough starter. Continue to feed, and I doubt you would ever notice it.

  • 4
    On top of that, it's not like there aren't bacteria and yeasts in the flour every time you feed your starter. If the starter's strains were weak enough to be easily displaced they likely would have been already.
    – Perkins
    Jun 16, 2022 at 22:13

"Flour with Leavening Improvers" generally means baking powder and/or chemical dough conditioners.

Your sourdough will be unaffected.

  • 4
    At least as long as the acidity doesn't change dramatically. Baking soda is quite basic, that's why you can use it to clean. A little of this "enhanced flour" won't kill your sour dough, but using only this flour to feed it, the pH level will increase quite a lot and probably make it harder for your cultures.
    – arne
    Jun 16, 2022 at 10:37

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