In healthy individuals, using protein powder in appropriate amounts and choosing a quality product is not known to directly “strain the heart.” Protein powder is simply a concentrated protein source. Cardiovascular risk is more strongly linked to overall lifestyle factors: chronic calorie surplus, high-sugar mass-gainer products, uncontrolled weight gain, high blood pressure, and inactivity. Another important distinction is product type. Some supplements include stimulants or high caffeine (often in pre-workout blends), which can increase palpitations and may be problematic for people with heart sensitivity. If you have hypertension, arrhythmia, cardiovascular disease, or kidney disease, supplementation should be individualized with medical guidance. A safer approach is a plain, caffeine-free protein powder with low added sugar and transparent labeling, used only to meet—not exceed—your daily target. If palpitations or chest discomfort occur, stop use and seek evaluation.