Although it's purported to increase one's energy, it's not suitable for everyone, since it's high in purine (a substance which the liver metabolizes into uric acid). For somebody whose medical history includes gout, not only does clam essence do no good, it can even exacerbate the gout.
高「普林」（一種含氮物質，經肝臟代謝形成尿酸）的蜆精，對有痛風病史的人來說，非但不能保健，還會引發痛風，適得其反。