Lactobacilli are non-spore-forming, gram-positive rods that are an important part of the normal human bacterial flora commonly found in the mouth, gastrointestinal (GI) tract, and female genitourinary tract. They can also appear as coryneform with a bent morphology or tend to grow in chains. Most species of lactobacilli are facultative anaerobes growing in either the presence or absence of an anaerobic environment.

They contribute to gut health by maintaining a balanced microbiome and can also have positive effects on digestion and immune function.

Bacillus is a genus of bacteria that includes several species known for their beneficial properties in various applications, including agriculture, food production, and probiotics.

Bacillus species are Gram-positive, rod-shaped bacteria that can form spores and thrive in aerobic or facultative anaerobic environments. This genus is commonly associated with soil habitats.

Additionally, bacilli exhibit greater stability during the processing and storage of food and pharmaceutical products, making them a more suitable ingredient for health-promoting formulations.

Bifidobacterium is a genus of gram-positive, nonmotile, and typically anaerobic bacteria, often exhibiting a branched structure. These bacteria are among the first to colonize the human gastrointestinal tract after birth and are thought to provide various health benefits to their host.

Bifidobacterium is one of the most abundant bacterial genera in adults, but its dominance is even more pronounced in infants, particularly during breastfeeding, when it can make up the majority of the total bacterial population.