Does Theanine cause change in the color of bowel movements?

Answer:
I looked at several websites and saw no mention of this side effect. However, I would speak if your l-theanine is GREEN it might cause a safe darkening of the stool.

Never have anyone mention melatonin doing this either.

Blood (or beets or Pepto-bismol) will turn the stool threatening. So if your stool is black you might want to have a strength care provider look into it.

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