紅毛五加的莖皮含丁香樹脂酚(syringa-resinol),胡蘿卜甙(daucosterol),常春藤皂甙元3-O-β-D-吡喃葡萄糖基-(1→2)α-L-吡喃拉阿伯糖甙[hederagenin-3-O-Βd-glu-copyranosyl-(1→2)-α-L-arabinopyranoside],齊墩果酸3-O-β-D-吡喃葡萄糖基-(1→2)-α-L-arabinopyranoside][1],常春藤皂甙元-3-O-α-L-arabinopyrano-side),常春藤皂甙元-3-O-α-L-吡喃鼠李糖基-(1→6)-β-D-吡喃葡萄糖甙[hederagenin-3-O-α-L-arabinopyranosyl-28-O-L-rhamnopyrano-syl-(1→4)-β-D-吡喃葡萄糖基-(1→6)-β-D-吡喃葡萄糖甙[hederagenin-3-O-α-L-arbinopyranosyl-28-O-L-rhamnopyrano-syl-(1→4)-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside],常春藤皂甙元-3-O-α-L-吡喃鼠李糖基-(1→6)-α-L-吡喃阿拉伯糖甙[hederagenin-3-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyra-noside],丁香酚葡萄糖甙(syringol-glucoside)[2],另外還含胸腺嘧啶(thymine),尿嘧啶(uracil),黃嘌呤(xanthine),腺嘌呤(ade-nine),次黃嘌呤(hypoxanthine),腺甙(adenosine),丙三醇(prepane-triol),鵝掌楸甙(liriodendrin),尿囊素(allantoin),D-甘露醇(D-mannitol)[3]和多糖(polysaccharide)。