Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

188 questions · 190 findings · 13 reviews · Headline outcomes only

No studies found 50 · 26.3%GRADE not reported 0 · 0%Very low 48 · 25.3%Low 52 · 27.4%Moderate 30 · 15.8%High 10 · 5.3%

Salicylic acid vs pyruvic acid

Participants' global self‐assessment of acne improvement Good to excellent improvement (medium term: treatment duration from 5 to 8 weeks) · participants with acne

It is very uncertain whether salicylic acid changes participants' global self‐assessment of acne improvement Good to… compared with pyruvic acid (very low certainty).

1 finding from 1 review

Salicylic acid vs pyruvic acid

Withdrawal for any reason (medium term: treatment duration from 5 to 8 weeks) · participants with acne

Salicylic acid showed no clear difference in withdrawal for any reason (medium term: treatment duration from 5 to… compared with pyruvic acid (low certainty).

1 finding from 1 review

Oral 5‐aminosalicylic acid vs 5‐aminosalicylic acid (5‐ASA) (mesalazine)

Failure to maintain clinical or endoscopic remission · Patients with quiescent ulcerative colitis

Oral 5‐aminosalicylic acid showed no clear difference in failure to maintain clinical or endoscopic remission compared with comparator 5‐aminosalicylic acid formulation (low certainty).

1 finding from 1 review

Oral 5‐aminosalicylic acid vs 5‐aminosalicylic acid (5‐ASA) (mesalazine)

Withdrawals due to adverse events · Patients with quiescent ulcerative colitis

It is very uncertain whether oral 5‐aminosalicylic acid changes withdrawal due to adverse events compared with comparator 5‐aminosalicylic acid formulation (very low certainty).

1 finding from 1 review

Oral 5‐aminosalicylic acid vs 5‐aminosalicylic acid (5‐ASA) (mesalazine)

Exclusion/withdrawal after entry · Patients with quiescent ulcerative colitis

Oral 5‐aminosalicylic acid showed no clear difference in exclusion/withdrawal after entry compared with comparator 5‐aminosalicylic acid formulation (moderate certainty).

1 finding from 1 review

Salicylic acid vs tretinoin

Participants' global self‐assessment of acne improvement Moderate to excellent improvement (long term: treatment duration > 8 weeks) · participants with acne

Salicylic acid showed no clear difference in participants' global self‐assessment of acne improvement Moderate to… compared with tretinoin (low certainty).

1 finding from 1 review