Across 6 studies, all 6 reported beneficial effects on skin health, with predominantly small effect sizes. The evidence is derived entirely from review articles, and no doses or study durations were consistently reported. Most studies focused on improvements in skin hydration and reduction of transepidermal water loss, particularly in middle-aged and elderly populations.
Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Evidence base is small (only 6 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests.
the administration of probiotics, synbiotics, and postbiotics in the treatment of cutaneous diseases has been shown to restore skin dyshomeostasis and to improve the symptoms of the reviewed skin conditions.
consuming Lactobacillus brevis SBC8803 has been reported to improve skin properties by enhancing skin hydration and reducing transepidermal water loss
consumption of Lactobacillus brevis SBC8803 was associated with skin improvement and prevention of skin dryness in healthy middle-aged and elderly subjects
consuming Lactobacillus brevis SBC8803 has been reported to improve skin hydration and suppress the increase in transepidermal water loss
There is preliminary evidence that certain probiotics given orally or topically could be used as a gentle intervention in diaper dermatitis.
Lactococcus lactis H61, which improves skin status in Japanese women with oral intake of heat-killed or live cells.