diff --git a/.changeset/protected-data-main-actor-code6-retry.md b/.changeset/protected-data-main-actor-code6-retry.md
new file mode 100644
index 00000000..c445c354
--- /dev/null
+++ b/.changeset/protected-data-main-actor-code6-retry.md
@@ -0,0 +1,5 @@
+---
+"@kingstinct/react-native-healthkit": patch
+---
+
+iOS: read `isProtectedDataAvailable` on the main actor in `isProtectedDataAvailableAsync` (`UIApplication` is `@MainActor`-isolated), and retry a statistics query once when HealthKit refuses with `errorDatabaseInaccessible` while protected data is available — the store re-opens a moment after the device unlocks, and a query issued in that window was surfacing as an opaque `Code=6` string.
diff --git a/packages/react-native-healthkit/ios/CoreModule.swift b/packages/react-native-healthkit/ios/CoreModule.swift
index 4aa43164..0faab243 100644
--- a/packages/react-native-healthkit/ios/CoreModule.swift
+++ b/packages/react-native-healthkit/ios/CoreModule.swift
@@ -320,7 +320,11 @@ class CoreModule: HybridCoreModuleSpec {
   }
 
   func isProtectedDataAvailableAsync() -> Promise<Bool> {
-    return Promise.resolved(withResult: UIApplication.shared.isProtectedDataAvailable)
+    return Promise.async {
+      return await MainActor.run {
+        UIApplication.shared.isProtectedDataAvailable
+      }
+    }
   }
 
   func isHealthDataAvailable() -> Bool {
diff --git a/packages/react-native-healthkit/ios/Helpers.swift b/packages/react-native-healthkit/ios/Helpers.swift
index 859de1b5..26118684 100644
--- a/packages/react-native-healthkit/ios/Helpers.swift
+++ b/packages/react-native-healthkit/ios/Helpers.swift
@@ -483,3 +483,31 @@ func buildStatisticsOptions(statistics: [StatisticsOptions], quantityType: HKQua
   }
   return opts
 }
+
+private let storeReopenRetryDelay: UInt64 = 1_000_000_000
+
+/// HealthKit seals its store the moment the device locks and re-opens it a beat
+/// after it unlocks, and iOS can resume the app inside that beat. A query that
+/// hits the gap fails with `errorDatabaseInaccessible` although protected data is
+/// reported available — the store is re-opening, not sealed. Runs `operation`
+/// and, on exactly that refusal, gives it one more attempt after a short delay.
+/// A refusal while protected data is unavailable is the sealed store itself and
+/// is thrown as-is, as is every other error.
+func retryingWhileStoreReopens<T>(
+  _ operation: () async throws -> T
+) async throws -> T {
+  do {
+    return try await operation()
+  } catch {
+    let nsError = error as NSError
+    guard nsError.domain == HKError.errorDomain,
+      nsError.code == HKError.Code.errorDatabaseInaccessible.rawValue
+    else { throw error }
+    let protectedDataAvailable = await MainActor.run {
+      UIApplication.shared.isProtectedDataAvailable
+    }
+    guard protectedDataAvailable else { throw error }
+    try await Task.sleep(nanoseconds: storeReopenRetryDelay)
+    return try await operation()
+  }
+}
diff --git a/packages/react-native-healthkit/ios/QuantityTypeModule.swift b/packages/react-native-healthkit/ios/QuantityTypeModule.swift
index 9a3cc9bd..9c178462 100644
--- a/packages/react-native-healthkit/ios/QuantityTypeModule.swift
+++ b/packages/react-native-healthkit/ios/QuantityTypeModule.swift
@@ -313,11 +313,13 @@ class QuantityTypeModule: HybridQuantityTypeModuleSpec {
     return Promise.async {
       let quantityType = try initializeQuantityType(identifier.stringValue)
 
-      if let gottenStats = try await queryStatisticsForQuantityInternal(
-        quantityType: quantityType,
-        statistics: statistics,
-        options: options
-      ) {
+      if let gottenStats = try await retryingWhileStoreReopens({
+        try await queryStatisticsForQuantityInternal(
+          quantityType: quantityType,
+          statistics: statistics,
+          options: options
+        )
+      }) {
         let unit = try await getUnitToUse(
           unitOverride: options?.unit,
           quantityType: quantityType
@@ -336,13 +338,15 @@ class QuantityTypeModule: HybridQuantityTypeModuleSpec {
     return Promise.async {
       let quantityType = try initializeQuantityType(identifier.stringValue)
 
-      if let statistics = try await queryStatisticsCollectionForQuantityInternal(
-        quantityType: quantityType,
-        statistics: statistics,
-        anchorDate: anchorDate,
-        intervalComponents: intervalComponents,
-        options: options
-      ) {
+      if let statistics = try await retryingWhileStoreReopens({
+        try await queryStatisticsCollectionForQuantityInternal(
+          quantityType: quantityType,
+          statistics: statistics,
+          anchorDate: anchorDate,
+          intervalComponents: intervalComponents,
+          options: options
+        )
+      }) {
 
         let unit = try await getUnitToUse(
           unitOverride: options?.unit,
@@ -385,11 +389,13 @@ class QuantityTypeModule: HybridQuantityTypeModuleSpec {
     return Promise.async {
       let quantityType = try initializeQuantityType(identifier.stringValue)
 
-      if let gottenStats = try await queryStatisticsForQuantityInternal(
-        quantityType: quantityType,
-        statistics: statistics,
-        options: options
-      ) {
+      if let gottenStats = try await retryingWhileStoreReopens({
+        try await queryStatisticsForQuantityInternal(
+          quantityType: quantityType,
+          statistics: statistics,
+          options: options
+        )
+      }) {
         let unit = try await getUnitToUse(
           unitOverride: options?.unit,
           quantityType: quantityType
@@ -412,13 +418,15 @@ class QuantityTypeModule: HybridQuantityTypeModuleSpec {
     return Promise.async {
       let quantityType = try initializeQuantityType(identifier.stringValue)
 
-      if let statistics = try await queryStatisticsCollectionForQuantityInternal(
-        quantityType: quantityType,
-        statistics: statistics,
-        anchorDate: anchorDate,
-        intervalComponents: intervalComponents,
-        options: options
-      ) {
+      if let statistics = try await retryingWhileStoreReopens({
+        try await queryStatisticsCollectionForQuantityInternal(
+          quantityType: quantityType,
+          statistics: statistics,
+          anchorDate: anchorDate,
+          intervalComponents: intervalComponents,
+          options: options
+        )
+      }) {
         let unit = try await getUnitToUse(
           unitOverride: options?.unit,
           quantityType: quantityType
diff --git a/packages/react-native-healthkit/src/healthkit.ios.ts b/packages/react-native-healthkit/src/healthkit.ios.ts
index d55c45a1..cc71c1d3 100644
--- a/packages/react-native-healthkit/src/healthkit.ios.ts
+++ b/packages/react-native-healthkit/src/healthkit.ios.ts
@@ -368,6 +368,8 @@ export const saveWorkoutSample = WorkoutBindings.saveWorkoutSample
 export const startWatchApp =
   Workouts.startWatchAppWithWorkoutConfiguration.bind(Workouts)
 export const isProtectedDataAvailable = Core.isProtectedDataAvailable.bind(Core)
+export const isProtectedDataAvailableAsync =
+  Core.isProtectedDataAvailableAsync.bind(Core)
 export const queryStateOfMindSamples =
   StateOfMindBindings.queryStateOfMindSamples
 export const queryStateOfMindSamplesWithAnchor =
@@ -461,6 +463,7 @@ export default {
   subscribeToQuantitySamples,
   startWatchApp,
   isProtectedDataAvailable,
+  isProtectedDataAvailableAsync,
   queryStateOfMindSamples,
   queryStateOfMindSamplesWithAnchor,
   saveStateOfMindSample,
diff --git a/packages/react-native-healthkit/src/healthkit.ts b/packages/react-native-healthkit/src/healthkit.ts
index 11df17f4..a8567b10 100644
--- a/packages/react-native-healthkit/src/healthkit.ts
+++ b/packages/react-native-healthkit/src/healthkit.ts
@@ -137,6 +137,10 @@ export const isProtectedDataAvailable = UnavailableFnFromModule(
   'isProtectedDataAvailable',
   false,
 )
+export const isProtectedDataAvailableAsync = UnavailableFnFromModule(
+  'isProtectedDataAvailableAsync',
+  Promise.resolve(false),
+)
 export const isObjectTypeAvailable = UnavailableFnFromModule(
   'isObjectTypeAvailable',
   false,
@@ -630,6 +634,7 @@ const HealthkitModule = {
   subscribeToChanges,
   startWatchApp,
   isProtectedDataAvailable,
+  isProtectedDataAvailableAsync,
   queryStateOfMindSamples,
   queryStateOfMindSamplesWithAnchor,
   saveStateOfMindSample,