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「肚乸」則相反，口感較軟和黏口，烹煮時易溶在湯汁內，行家稱之為「瀉身」。肚乸是「食用級」花膠，療效不及肚公，因此價錢比肚公平約一半。不是所有花膠種類都能單靠外表分辨公乸，不過大部分肚公會有兩條坑紋，是魚鰾的兩排氣孔，肚乸則沒有氣孔。�
花膠含有高濃度的蛋白質，對於有蛋白質過敏的人，可能會引起過敏反應，如皮膚瘙癢、紅疹或呼吸困難。患者肢體的末端都會特別的肥大，主要的特徵是手指頭或腳指頭因為過度生長而變寬變大及粗曠的顏面外觀，還會有精神上的異常。香港浸會大學中醫學碩士�