diff --git a/packages/core/src/DdSdkReactNative.tsx b/packages/core/src/DdSdkReactNative.tsx
index 881d42fbf..4bc448d2a 100644
--- a/packages/core/src/DdSdkReactNative.tsx
+++ b/packages/core/src/DdSdkReactNative.tsx
@@ -41,6 +41,7 @@ import { BufferSingleton } from './sdk/DatadogProvider/Buffer/BufferSingleton';
 import { NativeDdSdk } from './sdk/DdSdkInternal';
 import { GlobalState } from './sdk/GlobalState/GlobalState';
 import { UserInfoSingleton } from './sdk/UserInfoSingleton/UserInfoSingleton';
+import type { UserInfo } from './sdk/UserInfoSingleton/types';
 import { adaptLongTaskThreshold } from './utils/longTasksUtils';
 import { version as sdkVersion } from './version';
 
@@ -251,19 +252,23 @@ export class DdSdkReactNative {
     };
 
     /**
-     * Sets the user information.
-     * @param id: A mandatory unique user identifier (relevant to your business domain).
-     * @param name: The user name or alias.
-     * @param email: The user email.
-     * @param extraInfo: Additional information.
+     * Sets the user information. Requires a user ID — setting user properties
+     * like name or email implies a known user, so an ID must be provided.
+     * To add custom attributes without setting a user ID, use {@link addUserExtraInfo} instead.
+     * @param userInfo: The user object (id is required, name, email and extraInfo are optional).
      * @returns a Promise.
      */
-    static setUserInfo = async (userInfo: {
-        id: string;
-        name?: string;
-        email?: string;
-        extraInfo?: Record<string, unknown>;
-    }): Promise<void> => {
+    static setUserInfo = async (
+        userInfo: UserInfo & { id: string }
+    ): Promise<void> => {
+        if (typeof userInfo.id !== 'string' || userInfo.id.length === 0) {
+            InternalLog.log(
+                'setUserInfo requires a valid user ID. Please provide a non-empty string as the id field.',
+                SdkVerbosity.WARN
+            );
+            return;
+        }
+
         InternalLog.log(
             `Setting user ${JSON.stringify(userInfo)}`,
             SdkVerbosity.DEBUG
@@ -296,25 +301,8 @@ export class DdSdkReactNative {
             SdkVerbosity.DEBUG
         );
 
-        const userInfo = UserInfoSingleton.getInstance().getUserInfo();
-        if (!userInfo) {
-            InternalLog.log(
-                'Skipped adding User Extra Info: User Info is currently undefined. A user ID must be set before adding extra info. Please call setUserInfo() first.',
-                SdkVerbosity.WARN
-            );
-
-            return;
-        }
-        const updatedUserInfo = {
-            ...userInfo,
-            extraInfo: {
-                ...userInfo.extraInfo,
-                ...extraUserInfo
-            }
-        };
-
         await NativeDdSdk.addUserExtraInfo(extraUserInfo);
-        UserInfoSingleton.getInstance().setUserInfo(updatedUserInfo);
+        UserInfoSingleton.getInstance().addUserExtraInfo(extraUserInfo);
     };
 
     /**
diff --git a/packages/core/src/__tests__/DdSdkReactNative.test.tsx b/packages/core/src/__tests__/DdSdkReactNative.test.tsx
index 2ec1d2233..4a3902d32 100644
--- a/packages/core/src/__tests__/DdSdkReactNative.test.tsx
+++ b/packages/core/src/__tests__/DdSdkReactNative.test.tsx
@@ -1298,6 +1298,24 @@ describe('DdSdkReactNative', () => {
                 }
             });
         });
+
+        it('calls SDK method when addUserExtraInfo without prior setUserInfo', async () => {
+            // GIVEN
+            const extraInfo = { testId: 'abc123' };
+
+            // WHEN
+            await DdSdkReactNative.addUserExtraInfo(extraInfo);
+
+            // THEN
+            expect(NativeDdSdk.addUserExtraInfo).toHaveBeenCalledWith(
+                extraInfo
+            );
+            expect(UserInfoSingleton.getInstance().getUserInfo()).toEqual({
+                extraInfo: {
+                    testId: 'abc123'
+                }
+            });
+        });
     });
 
     describe('clearUserInfo', () => {
@@ -1320,9 +1338,9 @@ describe('DdSdkReactNative', () => {
             // THEN
             expect(NativeDdSdk.clearUserInfo).toHaveBeenCalledTimes(1);
             expect(NativeDdSdk.setUserInfo).toHaveBeenCalled();
-            expect(UserInfoSingleton.getInstance().getUserInfo()).toEqual(
-                undefined
-            );
+            expect(
+                UserInfoSingleton.getInstance().getUserInfo()
+            ).toBeUndefined();
         });
     });
 
diff --git a/packages/core/src/sdk/UserInfoSingleton/UserInfoSingleton.ts b/packages/core/src/sdk/UserInfoSingleton/UserInfoSingleton.ts
index 2408fdbf2..a33e494e9 100644
--- a/packages/core/src/sdk/UserInfoSingleton/UserInfoSingleton.ts
+++ b/packages/core/src/sdk/UserInfoSingleton/UserInfoSingleton.ts
@@ -11,9 +11,22 @@ import type { UserInfo } from './types';
 class UserInfoProvider {
     private userInfo: UserInfo | undefined = undefined;
 
-    setUserInfo = (userInfo: UserInfo) => {
+    setUserInfo = (userInfo: UserInfo & { id: string }) => {
+        if (typeof userInfo.id !== 'string' || userInfo.id.length === 0) {
+            return;
+        }
         this.userInfo = userInfo;
-        setCachedUserId(this.userInfo.id);
+        setCachedUserId(userInfo.id);
+    };
+
+    addUserExtraInfo = (extraInfo: Record<string, unknown>) => {
+        this.userInfo = {
+            ...this.userInfo,
+            extraInfo: {
+                ...this.userInfo?.extraInfo,
+                ...extraInfo
+            }
+        };
     };
 
     getUserInfo = (): UserInfo | undefined => {
diff --git a/packages/core/src/sdk/UserInfoSingleton/types.ts b/packages/core/src/sdk/UserInfoSingleton/types.ts
index dd14eb150..0c4975b75 100644
--- a/packages/core/src/sdk/UserInfoSingleton/types.ts
+++ b/packages/core/src/sdk/UserInfoSingleton/types.ts
@@ -5,7 +5,7 @@
  */
 
 export type UserInfo = {
-    readonly id: string;
+    readonly id?: string;
     readonly name?: string;
     readonly email?: string;
     readonly extraInfo?: Record<string, unknown>;
diff --git a/packages/core/src/types.tsx b/packages/core/src/types.tsx
index 4d3fda013..49dc64bc2 100644
--- a/packages/core/src/types.tsx
+++ b/packages/core/src/types.tsx
@@ -47,13 +47,12 @@ export type DdSdkType = {
     removeAttributes(keys: string[]): Promise<void>;
 
     /**
-     * Sets the user information.
-     * @param id: A unique user identifier (relevant to your business domain)
-     * @param name: The user name or alias.
-     * @param email: The user email.
-     * @param extraInfo: Additional information.
+     * Sets the user information. Requires a user ID — setting user properties
+     * like name or email implies a known user, so an ID must be provided.
+     * To add custom attributes without setting a user ID, use {@link addUserExtraInfo} instead.
+     * @param userInfo: The user object (id is required, name, email and extraInfo are optional).
      */
-    setUserInfo(userInfo: UserInfo): Promise<void>;
+    setUserInfo(userInfo: UserInfo & { id: string }): Promise<void>;
 
     /**
      * Clears the user information.
@@ -128,7 +127,7 @@ export type DdTraceType = {
 // Core
 
 export type UserInfo = {
-    id: string;
+    id?: string;
     name?: string;
     email?: string;
     extraInfo?: object;