# Food Additives Permitted in Feed and Drinking Water of Animals; Guanidinoacetic Acid
> **Food and Drug Administration** · Final rule. · Published 2021-07-14 · Effective 2021-07-14 · 86 FR 37037
## Document
- **Document number:** 2021-15070
- **Category:** fda-food
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 86 FR 37037
- **CFR reference:** 21 CFR 573
- **Publication date:** 2021-07-14
- **Effective date:** 2021-07-14
- **HHS docket:** Docket No. FDA-2019-F-5401
## Abstract

The Food and Drug Administration (FDA, we, or the Agency) is amending the regulations for food additives permitted in feed and drinking water of animals to provide for the safe use of guanidinoacetic acid as a precursor of creatine in poultry feeds. This action is in response to a food additive petition filed by Alzchem Trostberg GmbH.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/07/14/2021-15070/food-additives-permitted-in-feed-and-drinking-water-of-animals-guanidinoacetic-acid)
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