The Advanced Bio Cultures Complex by VitaBright is an impressive contender in the probiotic market, boasting a high dose of 45 billion live bacteria per serving. VitaBright promises that these bacteria stay alive until the expiry date – a guarantee that's rarely seen on probiotic labels. With 17 well-researched strains, this supplement offers an unusually broad and well-balanced boost to your gut flora. It’s free from allergens, including dairy which often appears in probiotics. It’s also a dairy-free vegan probiotic. Plus, it doesn’t require refrigeration, and it even includes prebiotic inulin to help nourish the good bacteria.

However, there are a couple of things to consider. The capsules aren’t gastro-resistant, which means some of the bacteria might not survive the journey through the stomach acid. Additionally, the formula includes some bulking agents and anti-caking agents.

Despite these minor downsides, Advanced Bio Cultures Complex remains an outstanding runner-up, thanks to its high potency, diverse strains, and added prebiotics.