GET /other/substance.json

fda.gov:fda-open-api

Summary: Search substances and ingredients
Operation ID: getSubstance
Auth: api_key
Description

Returns information about substances, ingredients, and chemicals regulated by FDA.

Parameters (4)

count (string, query, optional)

Field to count unique values for

limit (integer, query, optional, default: 1)

Number of results to return (max 100)

Constraints: {'minimum': 1, 'maximum': 100}

search (string, query, optional)

Search query using field:value syntax

skip (integer, query, optional, default: 0)

Number of results to skip

Constraints: {'minimum': 0}

Examples (3)

TitleTypeURLAction
Search for aspirin substance curl https://api.fda.gov/other/substance.json?search=aspirin&limit=1
Search with pagination (limit and skip) curl https://api.fda.gov/other/substance.json?search=ethanol&limit=5&skip=0
Count unique values by registration status curl https://api.fda.gov/other/substance.json?count=registration_status

Probe History

Latency

Status Codes

TimeStatusLatencySize
2026-03-23 10:47:25.488907 200 960ms
2026-03-23 09:38:08.050047 200 941ms
2026-03-23 09:09:38.472778 404 934ms

Response Changes

WhenOldNew
2026-03-23 09:38:08.050047 31b3fce01c8d 441f61587b5c
2026-03-23 10:47:25.488907 441f61587b5c cfe9b75492ae