Long life, good memory, intelligence, perfect health, youthfulness, excellence of complexion, color, voice, and magnanimity, as well as an increase in the strength of the body and sense organs—
वाक्सिद्धिं वृषतां कान्तिमवाप्नोति रसायनात् । लाभोपायो हि शस्तानां रसादीनां रसायनम् ॥ २ ॥
perfection in speech, virility (vṛṣatā), and brilliance are all obtained from Rasāyana therapy. Rasāyana is indeed the premier means of obtaining and maintaining rasa and other dhātus (body tissues) in an optimal, healthy condition.
पूर्वे वयसि मध्ये वा तत्प्रयोज्यं जितात्मनः । स्निग्धस्य स्रुतरक्तस्य विशुद्धस्य च सर्वथा ॥ ३ ॥
It should be administered to persons in their early age or middle age and always to those who are self-controlled, who have undergone oleation, bloodletting and purificatory therapies in every way.
अविशुद्धे शरीरे हि युक्तो रासायनो विधिः । वाजीकरो वा मलिने वस्त्रे रङ्ग इवाफलः ॥ ४ ॥
Rasayana (rejuvenation) or vajikarana (aphrodisiac) therapies administered to those, whose body has not been purified becomes useless, just as coloring a dirty cloth.
Rasayana (rejuvenation) therapy is of two kinds as known to the sages. 1. Kutipraveshika the important one (greatly beneficial) and 2. Vataatapika the other (less beneficial).