diff --git a/goldens/public-api/core/primitives/di/index.api.md b/goldens/public-api/core/primitives/di/index.api.md
index d44a6fdcfe1..723552bb759 100644
--- a/goldens/public-api/core/primitives/di/index.api.md
+++ b/goldens/public-api/core/primitives/di/index.api.md
@@ -4,11 +4,18 @@
 
 ```ts
 
+// @public (undocumented)
+export function defineInjectable<T>(opts: {
+    token: unknown;
+    providedIn?: Type<any> | 'root' | 'platform' | 'any' | 'environment' | null;
+    factory: () => T;
+}): unknown;
+
 // @public (undocumented)
 export function getCurrentInjector(): Injector | undefined | null;
 
 // @public (undocumented)
-export function inject<T>(token: InjectionToken<T>, options?: unknown): T | NotFound;
+export function inject<T>(token: InjectionToken<T> | Constructor<T>, options?: unknown): T | NotFound;
 
 // @public
 export interface InjectionToken<T> {
diff --git a/packages/core/primitives/di/index.ts b/packages/core/primitives/di/index.ts
index 705c5dcd337..d0974481569 100644
--- a/packages/core/primitives/di/index.ts
+++ b/packages/core/primitives/di/index.ts
@@ -11,4 +11,4 @@ export type {Injector} from './src/injector';
 export {NOT_FOUND, NotFoundError, isNotFound} from './src/not_found';
 export type {NotFound} from './src/not_found';
 export type {InjectionToken, ɵɵInjectableDeclaration} from './src/injection_token';
-export {registerInjectable} from './src/injection_token';
+export {defineInjectable, registerInjectable} from './src/injection_token';
diff --git a/packages/core/primitives/di/src/injection_token.ts b/packages/core/primitives/di/src/injection_token.ts
index d16cb103d17..06cf0080fce 100644
--- a/packages/core/primitives/di/src/injection_token.ts
+++ b/packages/core/primitives/di/src/injection_token.ts
@@ -80,7 +80,7 @@ export function defineInjectable<T>(opts: {
   } as ɵɵInjectableDeclaration<T>;
 }
 
-type Constructor<T> = Function & {prototype: T};
+export type Constructor<T> = Function & {prototype: T};
 
 export function registerInjectable<T>(
   ctor: unknown,
diff --git a/packages/core/primitives/di/src/injector.ts b/packages/core/primitives/di/src/injector.ts
index d675192138b..61bf332f0a5 100644
--- a/packages/core/primitives/di/src/injector.ts
+++ b/packages/core/primitives/di/src/injector.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-import {InjectionToken} from './injection_token';
+import {Constructor, InjectionToken} from './injection_token';
 import {NotFound, NOT_FOUND} from './not_found';
 
 export interface Injector {
@@ -33,10 +33,13 @@ export function setCurrentInjector(
   return former;
 }
 
-export function inject<T>(token: InjectionToken<T>, options?: unknown): T | NotFound {
+export function inject<T>(
+  token: InjectionToken<T> | Constructor<T>,
+  options?: unknown,
+): T | NotFound {
   const currentInjector = getCurrentInjector();
-  if (!currentInjector) {
+  if (!currentInjector || !(token as InjectionToken<T>).ɵprov) {
     return NOT_FOUND;
   }
-  return currentInjector.retrieve(token, options);
+  return currentInjector.retrieve(token as InjectionToken<T>, options);
 }