diff --git a/DoseMathTests/DoseMathTests.swift b/DoseMathTests/DoseMathTests.swift
index f2c1b495cf..6637784f2b 100644
--- a/DoseMathTests/DoseMathTests.swift
+++ b/DoseMathTests/DoseMathTests.swift
@@ -347,7 +347,7 @@ class RecommendTempBasalTests: XCTestCase {
             lastTempBasal: nil
         )
 
-        XCTAssertEqual(1.425, dose!.unitsPerHour, accuracy: 1.0 / 40.0)
+        XCTAssertEqual(1.60, dose!.unitsPerHour, accuracy: 1.0 / 40.0)
         XCTAssertEqual(TimeInterval(minutes: 30), dose!.duration)
     }
 
@@ -365,7 +365,7 @@ class RecommendTempBasalTests: XCTestCase {
             lastTempBasal: nil
         )
 
-        XCTAssertEqual(1.475, dose!.unitsPerHour, accuracy: 1.0 / 40.0)
+        XCTAssertEqual(1.60, dose!.unitsPerHour, accuracy: 1.0 / 40.0)
         XCTAssertEqual(TimeInterval(minutes: 30), dose!.duration)
     }
 
@@ -588,7 +588,7 @@ class RecommendBolusTests: XCTestCase {
             volumeRounder: fortyIncrementsPerUnitRounder
         )
 
-        XCTAssertEqual(1.575, dose.amount)
+        XCTAssertEqual(1.7, dose.amount)
 
         if case BolusRecommendationNotice.currentGlucoseBelowTarget(let glucose) = dose.notice! {
             XCTAssertEqual(glucose.quantity.doubleValue(for: .milligramsPerDeciliter), 60)
@@ -657,7 +657,7 @@ class RecommendBolusTests: XCTestCase {
             volumeRounder: fortyIncrementsPerUnitRounder
         )
         
-        XCTAssertEqual(1.4, dose.amount)
+        XCTAssertEqual(1.575, dose.amount)
         XCTAssertEqual(BolusRecommendationNotice.predictedGlucoseBelowTarget(minGlucose: glucose[1]), dose.notice!)
     }
 
@@ -676,7 +676,7 @@ class RecommendBolusTests: XCTestCase {
             volumeRounder: fortyIncrementsPerUnitRounder
         )
         
-        XCTAssertEqual(0.575, dose.amount)
+        XCTAssertEqual(0.7, dose.amount)
     }
 
     func testStartVeryLowEndHigh() {
@@ -708,7 +708,7 @@ class RecommendBolusTests: XCTestCase {
             maxBolus: maxBolus
         )
 
-        XCTAssertEqual(1.575, dose.amount, accuracy: 1.0 / 40.0)
+        XCTAssertEqual(1.7, dose.amount, accuracy: 1.0 / 40.0)
     }
 
     func testHighAndFalling() {
@@ -724,7 +724,7 @@ class RecommendBolusTests: XCTestCase {
             maxBolus: maxBolus
         )
 
-        XCTAssertEqual(0.325, dose.amount, accuracy: 1.0 / 40.0)
+        XCTAssertEqual(0.4, dose.amount, accuracy: 1.0 / 40.0)
     }
 
     func testInRangeAndRising() {
@@ -740,7 +740,7 @@ class RecommendBolusTests: XCTestCase {
             maxBolus: maxBolus
         )
 
-        XCTAssertEqual(0.325, dose.amount, accuracy: 1.0 / 40.0)
+        XCTAssertEqual(0.4, dose.amount, accuracy: 1.0 / 40.0)
 
         // Less existing temp
 
@@ -771,7 +771,7 @@ class RecommendBolusTests: XCTestCase {
             volumeRounder: fortyIncrementsPerUnitRounder
         )
 
-        XCTAssertEqual(0.275, dose.amount)
+        XCTAssertEqual(0.375, dose.amount)
     }
 
     func testHighAndRising() {
@@ -787,7 +787,7 @@ class RecommendBolusTests: XCTestCase {
             maxBolus: maxBolus
         )
 
-        XCTAssertEqual(1.25, dose.amount)
+        XCTAssertEqual(1.35, dose.amount, accuracy: 1.0 / 40.0)
 
         // Use mmol sensitivity value
         let insulinSensitivitySchedule = InsulinSensitivitySchedule(unit: HKUnit.millimolesPerLiter, dailyItems: [RepeatingScheduleValue(startTime: 0.0, value: 10.0 / 3)])!
@@ -802,7 +802,7 @@ class RecommendBolusTests: XCTestCase {
             maxBolus: maxBolus
         )
 
-        XCTAssertEqual(1.25, dose.amount, accuracy: 1.0 / 40.0)
+        XCTAssertEqual(1.35, dose.amount, accuracy: 1.0 / 40.0)
     }
 
     func testRiseAfterDIA() {
diff --git a/Loop/Managers/DoseMath.swift b/Loop/Managers/DoseMath.swift
index 5502084671..b10e4450c0 100644
--- a/Loop/Managers/DoseMath.swift
+++ b/Loop/Managers/DoseMath.swift
@@ -267,7 +267,8 @@ extension Collection where Element: GlucoseValue {
             // Compute the dose required to bring this prediction to target:
             // dose = (Glucose Δ) / (% effect × sensitivity)
 
-            let percentEffected = 1 - model.percentEffectRemaining(at: time)
+            // For 0 <= time <= effectDelay, assume a small amount effected. This will result in large unit recommendation rather than no recommendation at all.
+            let percentEffected = Swift.max(.ulpOfOne, 1 - model.percentEffectRemaining(at: time))
             let effectedSensitivity = percentEffected * sensitivityValue
             guard let correctionUnits = insulinCorrectionUnits(
                 fromValue: predictedGlucoseValue,
@@ -299,7 +300,7 @@ extension Collection where Element: GlucoseValue {
             eventual.quantity < eventualGlucoseTargets.lowerBound
         {
             let time = min.startDate.timeIntervalSince(date)
-            // For time = 0, assume a small amount effected. This will result in large (negative) unit recommendation rather than no recommendation at all.
+            // For 0 <= time <= effectDelay, assume a small amount effected. This will result in large (negative) unit recommendation rather than no recommendation at all.
             let percentEffected = Swift.max(.ulpOfOne, 1 - model.percentEffectRemaining(at: time))
 
             guard let units = insulinCorrectionUnits(
diff --git a/LoopCore/Insulin/ExponentialInsulinModelPreset.swift b/LoopCore/Insulin/ExponentialInsulinModelPreset.swift
index e2f0877ed8..e65cdd1fb7 100644
--- a/LoopCore/Insulin/ExponentialInsulinModelPreset.swift
+++ b/LoopCore/Insulin/ExponentialInsulinModelPreset.swift
@@ -38,9 +38,20 @@ extension ExponentialInsulinModelPreset {
             return .minutes(55)
         }
     }
+    
+    var effectDelay: TimeInterval {
+        switch self {
+        case .humalogNovologAdult:
+            return .minutes(10)
+        case .humalogNovologChild:
+            return .minutes(10)
+        case .fiasp:
+            return .minutes(10)
+        }
+    }
 
     var model: InsulinModel {
-        return ExponentialInsulinModel(actionDuration: actionDuration, peakActivityTime: peakActivity)
+        return ExponentialInsulinModel(actionDuration: actionDuration, peakActivityTime: peakActivity, delay: effectDelay)
     }
 }
 
@@ -49,6 +60,10 @@ extension ExponentialInsulinModelPreset: InsulinModel {
     public var effectDuration: TimeInterval {
         return model.effectDuration
     }
+    
+    public var delay: TimeInterval {
+        return model.delay
+    }
 
     public func percentEffectRemaining(at time: TimeInterval) -> Double {
         return model.percentEffectRemaining(at: time)