skin · Outcome
Clearer skin. Better hydration. Fewer breakouts.
How to measure:
Three levers, one stack. Each works through a different mechanism. They compound.
+2% skin score
10-50 billion CFU daily
Evidence
Effect size
Corpus
11 papers
range +2% skin score · n=2 quantitative claims
“After 12 weeks of oral probiotic intervention, probiotics significantly reduced disease severity grading in acne patients compared to control.”
No corpus-backed pick yet
We require at least 3 corpus papers for a habit to surface here. The literature on this outcome × pillar is still being extracted.
No corpus-backed pick yet
We require at least 3 corpus papers for a food to surface here. The literature on this outcome × pillar is still being extracted.
Everything we found, ranked by how strongly we recommend it. Tap any to see the studies.
Top pick
The one we recommend first
Also recommended
Evidence-backed alternatives or additions
Worth considering
Only in specific contexts (see card)
Skip
Commonly suggested, not supported
Every pick has two signals. They answer different questions and we never bundle them into one number.
Effect size
How big is the change on skin quality, in the units that matter for this outcome.
Confidence
How sure are we the effect is real for skin quality, given the studies we have.
For every pick, the “papers” number is how many studies we've cataloged that test this entity for skin quality. “Favorable” means the study reported the direction you want.
The tier badge (S, A, B…) on the entity itself is its overall research confidence across all outcomes. It's the same letter wherever you see this entity on the site, not specific to skin quality.
Want to browse supplements directly instead? See the full catalog →