Charak Samhita
तत्र श्लोकः- रसायनानां संयोगाः सिद्धाभूतहितैषिणा। निर्दिष्टाः प्राणकामीये सप्तत्रिंशन्महर्षिणा ॥२३॥
[Summary] Now the summing up verse - In this quarter relating to desire for vital strength the great sage, compassionate on creatures, described thirty seven successful formulations of rasayana.
english translation
tatra zlokaH- rasAyanAnAM saMyogAH siddhAbhUtahitaiSiNA। nirdiSTAH prANakAmIye saptatriMzanmaharSiNA ॥23॥
hk transliteration by Sanscript