Mixed
Oral administration of berberine requires gut microbiota-mediated conversion to dihydroberberine (dhBBR) for effective intestinal absorption; without this microbial conversion, berberine bioavailability and therapeutic efficacy are significantly reduced.
Berberine's effectiveness depends on your gut health. It is not absorbed directly; your gut bacteria must first convert it into dihydroberberine. If you are taking antibiotics or have gut dysbiosis, berberine may not work well because this conversion process is impaired. Maintaining a healthy gut microbiome is essential for berberine to function as intended.
The gut microbiota converts BBR into its absorbable form of dihydroberberine (dhBBR), which has an intestinal absorption rate 5-fold that of BBR in animals... The diminution of intestinal bacteria via orally treating KK-Ay mice with antibiotics decreased the BBR-to-dhBBR conversion and blood BBR; accordingly, the lipid- and glucose-lowering efficacy of BBR was reduced.
Why this rating
Strong mechanistic evidence in rats and mice with clear in vitro validation, though human clinical data on microbiota dependence is implied rather than directly tested in humans.
Source
Transforming berberine into its intestine-absorbable form by the gut microbiota
Ru Feng et al. · Scientific Reports · 2015
DOI 10.1038/srep12155
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