Lactobacillus bulgaricus

Used with Streptococcus thermophilus to turn milk into yogurt.

An important nuance: whether a culture produces histamine is strain-dependent, not automatic for the whole species. Some L. bulgaricus strains decarboxylate histidine into histamine and some do not, and a tub of yogurt never tells you which strain it used.

It is rated high because you cannot tell them apart from the label, and because fermented dairy as a category behaves very differently from the fresh milk it starts as.