diff --git a/src/truststore/_api.py b/src/truststore/_api.py
index 47b7a63..de087e0 100644
--- a/src/truststore/_api.py
+++ b/src/truststore/_api.py
@@ -17,7 +17,7 @@
 if platform.system() == "Windows":
     from ._windows import _configure_context, _verify_peercerts_impl
 elif platform.system() == "Darwin":
-    from ._macos import _configure_context, _verify_peercerts_impl
+    from ._macos import _configure_context, _verify_peercerts_impl, _load_default_certs_impl
 else:
     from ._openssl import _configure_context, _verify_peercerts_impl
 
@@ -166,7 +166,10 @@ def load_cert_chain(
     def load_default_certs(
         self, purpose: ssl.Purpose = ssl.Purpose.SERVER_AUTH
     ) -> None:
-        return self._ctx.load_default_certs(purpose)
+        if sys.platform == "darwin":
+            return _load_default_certs_impl(self._ctx)
+        else:
+            return self._ctx.load_default_certs(purpose)
 
     def set_alpn_protocols(self, alpn_protocols: typing.Iterable[str]) -> None:
         return self._ctx.set_alpn_protocols(alpn_protocols)
@@ -189,19 +192,17 @@ def cert_store_stats(self) -> dict[str, int]:
     def set_default_verify_paths(self) -> None:
         self._ctx.set_default_verify_paths()
 
-    @typing.overload
-    def get_ca_certs(
-        self, binary_form: typing.Literal[False] = ...
-    ) -> list[typing.Any]: ...
-
     @typing.overload
     def get_ca_certs(self, binary_form: typing.Literal[True] = ...) -> list[bytes]: ...
 
     @typing.overload
     def get_ca_certs(self, binary_form: bool = ...) -> typing.Any: ...
 
-    def get_ca_certs(self, binary_form: bool = False) -> list[typing.Any] | list[bytes]:
-        raise NotImplementedError()
+    @typing.overload
+    def get_ca_certs(self, binary_form: bool = ...) -> typing.Any: ...
+    
+    def get_ca_certs(self, binary_form: bool = False):
+        return self._ctx.get_ca_certs(binary_form=binary_form)
 
     @property
     def check_hostname(self) -> bool:
diff --git a/src/truststore/_macos.py b/src/truststore/_macos.py
index 3450307..623cc35 100644
--- a/src/truststore/_macos.py
+++ b/src/truststore/_macos.py
@@ -76,7 +76,8 @@ def _load_cdll(name: str, macos10_16_path: str) -> CDLL:
 CFArrayCallBacks = c_void_p
 CFOptionFlags = c_uint32
 
-SecCertificateRef = POINTER(c_void_p)
+SecCertificate = c_void_p
+SecCertificateRef = POINTER(SecCertificate)
 SecPolicyRef = POINTER(c_void_p)
 SecTrustRef = POINTER(c_void_p)
 SecTrustResultType = c_uint32
@@ -86,7 +87,7 @@ def _load_cdll(name: str, macos10_16_path: str) -> CDLL:
     Security.SecCertificateCreateWithData.argtypes = [CFAllocatorRef, CFDataRef]
     Security.SecCertificateCreateWithData.restype = SecCertificateRef
 
-    Security.SecCertificateCopyData.argtypes = [SecCertificateRef]
+    Security.SecCertificateCopyData.argtypes = [SecCertificate]
     Security.SecCertificateCopyData.restype = CFDataRef
 
     Security.SecCopyErrorMessageString.argtypes = [OSStatus, c_void_p]
@@ -123,6 +124,9 @@ def _load_cdll(name: str, macos10_16_path: str) -> CDLL:
     ]
     Security.SecTrustEvaluate.restype = OSStatus
 
+    Security.SecTrustCopyAnchorCertificates.argtypes = [CFArrayRef]
+    Security.SecTrustCopyAnchorCertificates.restype = OSStatus
+
     Security.SecTrustRef = SecTrustRef  # type: ignore[attr-defined]
     Security.SecTrustResultType = SecTrustResultType  # type: ignore[attr-defined]
     Security.OSStatus = OSStatus  # type: ignore[attr-defined]
@@ -181,10 +185,10 @@ def _load_cdll(name: str, macos10_16_path: str) -> CDLL:
     CoreFoundation.CFArrayAppendValue.argtypes = [CFMutableArrayRef, c_void_p]
     CoreFoundation.CFArrayAppendValue.restype = None
 
-    CoreFoundation.CFArrayGetCount.argtypes = [CFArrayRef]
+    CoreFoundation.CFArrayGetCount.argtypes = [CFArray]
     CoreFoundation.CFArrayGetCount.restype = CFIndex
 
-    CoreFoundation.CFArrayGetValueAtIndex.argtypes = [CFArrayRef, CFIndex]
+    CoreFoundation.CFArrayGetValueAtIndex.argtypes = [CFArray, CFIndex]
     CoreFoundation.CFArrayGetValueAtIndex.restype = c_void_p
 
     CoreFoundation.CFErrorGetCode.argtypes = [CFErrorRef]
@@ -200,6 +204,7 @@ def _load_cdll(name: str, macos10_16_path: str) -> CDLL:
         CoreFoundation, "kCFTypeArrayCallBacks"
     )
 
+    CoreFoundation.CFArray = CFArray # type: ignore[attr-defined]
     CoreFoundation.CFTypeRef = CFTypeRef  # type: ignore[attr-defined]
     CoreFoundation.CFArrayRef = CFArrayRef  # type: ignore[attr-defined]
     CoreFoundation.CFStringRef = CFStringRef  # type: ignore[attr-defined]
@@ -278,7 +283,7 @@ def _handle_osstatus(result: OSStatus, _: typing.Any, args: typing.Any) -> typin
 Security.SecTrustSetAnchorCertificatesOnly.errcheck = _handle_osstatus  # type: ignore[assignment]
 Security.SecTrustGetTrustResult.errcheck = _handle_osstatus  # type: ignore[assignment]
 Security.SecTrustEvaluate.errcheck = _handle_osstatus  # type: ignore[assignment]
-
+Security.SecTrustCopyAnchorCertificates.errcheck = _handle_osstatus # type: ignore[assignment]
 
 class CFConst:
     """CoreFoundation constants"""
@@ -569,3 +574,39 @@ def _verify_peercerts_impl_macos_10_14(
         finally:
             if cf_error_string_ref:
                 CoreFoundation.CFRelease(cf_error_string_ref)
+
+try:
+    CoreFoundation.CFRelease.argtypes = [CFType]
+except AttributeError as e:
+    raise ImportError(f"Error initializing ctypes: {e}") from None
+
+def _load_default_certs_impl(ssl_context: ssl.SSLContext) -> None:
+    """
+    Loads the default system certificates into the SSLContext.
+    """
+
+    certs_array = CFArray(None)
+    Security.SecTrustCopyAnchorCertificates(
+        ctypes.byref(certs_array)
+    )
+
+    count = CoreFoundation.CFArrayGetCount(certs_array)
+
+    for i in range(count):
+        # Get the certificate from the array
+        cert_ref = CoreFoundation.CFArrayGetValueAtIndex(certs_array, i)
+        data_ref = Security.SecCertificateCopyData(cert_ref)
+
+        length = CoreFoundation.CFDataGetLength(data_ref)
+        data_ptr = CoreFoundation.CFDataGetBytePtr(data_ref)
+
+        cert_bytes = ctypes.string_at(data_ptr, length)
+
+        # Load the certificate into the SSLContext
+        ssl_context.load_verify_locations(
+            cadata=cert_bytes
+        )
+
+        CoreFoundation.CFRelease(data_ref)
+
+    CoreFoundation.CFRelease(certs_array)
\ No newline at end of file