On April 18, 2026, the U.S. Food and Drug Administration (FDA) officially implemented the new version of the Guidance for Amino Acid-Based Additives for Food Contact Use, establishing for the first time specific migration limits (SMLs) for natural amino acid derivatives such as tyrosine, aspartic acid, and leucine, and clearly requiring new product submissions to include biodegradability and metal ion chelation stability data. This adjustment directly affects the market access efficiency and testing costs of amino acid raw materials exported from China to the U.S. in downstream application fields such as food packaging materials and nutritional supplement carriers, and deserves close attention from the food contact materials supply chain, export-oriented amino acid manufacturers, and compliance service providers.

Event Overview

The U.S. Food and Drug Administration (FDA) put into effect the new version of Guidance for Industry: Amino Acid-Based Substances Used in Food Contact Applications on April 18, 2026. For the first time, the guidance sets specific migration limits (SMLs) for natural amino acid derivatives such as tyrosine, aspartic acid, and leucine, and requires all new product submissions to simultaneously provide biodegradability and metal ion chelation stability data. The currently available public information is limited to the text of the guidance and its effective date, and does not cover transitional arrangements, exemption clauses for existing products, or detailed supporting testing methods.

Which market segments will be affected

Direct trading companies: mainly refers to foreign trade companies engaged in exporting amino acid raw materials to the U.S. As the guidance directly links migration limits with submission pathways, the compliance risk of their agency filing work has increased; the impact is reflected in longer preparation cycles for export documents, more types of third-party testing reports, and greater uncertainty in customs clearance.

Raw material procurement companies: including domestic manufacturers of food packaging additives and producers of nutritional softgel shells. If the amino acid additives they procure are used in end products for the U.S. market, they need to reconfirm whether suppliers meet the new guidance's data requirements; the impact is mainly reflected in higher upstream qualification audit costs, the launch of substitute raw material evaluations, and the risk that some batches may face temporary suspension of use.

Processing and manufacturing companies: specifically refers to enterprises developing food contact materials with amino acids as functional components (such as biodegradable films and active packaging coatings). The newly added biodegradability and metal ion chelation stability requirements in the guidance constitute new technical barriers for product registration; the impact is concentrated in longer R&D validation cycles, more testing items, and the need for existing formulations to supplement stability testing.

Supply chain service companies: covering institutions that provide FDA submission agency, compliance consulting, and testing coordination services. The new guidance brings changes to the structure of submission materials and expansion of data dimensions, putting service response capabilities to the test; the impact is reflected in a phased increase in customer inquiries, greater pressure in coordinating testing resources, and increased demand for technical interpretation services.

What key points should relevant enterprises or practitioners focus on, and how should they respond at present

Pay attention to whether FDA will subsequently issue supporting Q&A or implementation notes

The current guidance does not clearly specify the applicability to existing submitted products, the length of any transition period, or the list of accepted testing methods. Based on analysis, FDA may provide supplementary explanations within the next few months in the form of Industry Q&A. Enterprises are advised to continuously track updates on its official website and avoid making long-term investment decisions based on a single text alone.

Differentiate key product categories and key application scenarios, and prioritize evaluation of high-risk items

Tyrosine, aspartic acid, and leucine are the three substances specifically named in the guidance for SMLs, and are widely used in nutritional supplement carriers and high-end food packaging coatings. From an industry perspective, scenarios such as nutritional softgels exported to the U.S., plant-based edible packaging, and composite packaging materials fortified with trace metal elements should be listed as the first batch of compliance review targets.

Review existing submission files and gaps in testing capabilities in advance

Enterprises need to check against the guidance whether the amino acid derivatives used are covered by existing FDA Food Contact Notifications (FCN) or indirect additive authorizations (21 CFR 170–199), and whether they have testing capabilities or cooperation channels for biodegradability (such as the OECD 301 series) and metal chelation stability (such as ICP-MS combined with complexometric titration).

Strengthen upfront communication with downstream brand owners and testing institutions

In the export chain to the U.S., brand owners often take the lead in compliance responsibility allocation. What deserves more attention at present is that some international nutrition product customers have already begun embedding compliance clauses for the new guidance into procurement agreements. Export enterprises are advised to proactively synchronize progress with customers and establish pre-communication mechanisms with testing institutions holding FDA-recognized qualifications, so as to shorten formal sample submission response times.

Editor’s Viewpoint / Industry Observation

From observation, this guidance update is not an isolated technical revision, but rather an extension of FDA's systematic regulatory approach to bio-based food contact substances—encouraging green material innovation while strengthening assessment of their migration behavior and chemical stability in real food-simulating environments. It is more appropriate to interpret it as a signal of an "upgraded compliance threshold" rather than an immediately effective comprehensive market access restriction. At present, there have been no mandatory recalls or import suspension notifications, but the new submission pathway has already taken effect immediately, meaning that incremental products entering the U.S. market afterward must meet the new rules. The industry needs to continue monitoring the potential convergence trend between this and the evaluation logic for similar substances under EU EC No. 10/2011.

Conclusion: This FDA guidance update marks that the regulation of amino acid-based food contact additives has entered a new stage of quantitative control. Its core significance lies not in overturning the existing system, but in transforming the previously relatively broad Generally Recognized as Safe (GRAS) principle into technical indicators that are measurable, verifiable, and comparable. For relevant enterprises, it is more appropriate at present to regard this as an opportunity to recalibrate compliance capabilities for high-value export markets, rather than as a short-term disruptive policy change.

Information source note:
Main source: Guidance for Industry: Amino Acid-Based Substances Used in Food Contact Applications published on the official website of the U.S. Food and Drug Administration (FDA) (effective date: April 18, 2026).
Items to be continuously observed: whether FDA will introduce transition arrangements, explanatory notes on the retrospective applicability of existing FCN products, and a list of recommended supporting testing methods.