Bromelain is not commonly recognized as a direct cause of palpitations. In real-world use, palpitations often relate to added stimulants (caffeine/green tea/guarana) in combination products or to fluid/electrolyte shifts in “water loss” blends. If palpitations occur after starting a supplement, stop it and review ingredients. Seek urgent care if red-flag symptoms (chest pain, fainting, shortness of breath) occur. High-risk individuals should consult a clinician first.