The all-spore probiotic that made the brand, in the starter bottle.

Five Bacillus strains, each a spore former, so they survive the trip through stomach acid without refrigeration or a special capsule. The blend includes HU36, which produces carotenoids in the gut, and HU58, the strain Microbiome Labs sells on its own.

It comes as 60 capsules. Microbiome Labs works on the microbiome rather than around it, and third-party tests every batch it makes in the United States.

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