The Compendium of Caraka 6.1.3.1

6.1.3.1

athātaḥ karapracitīyaṃ rasāyanapādaṃ vyākhyāsyāmaḥ//
prayujya prayatā muktāḥ śramavyādhijarābhayāt/
yāvadaicchaṃstapastepustatprabhāvānmahābalāḥ//
idaṃ rasāyanaṃ cakre brahmā vārṣasahasrikam/
jarāvyādhipraśamanaṃ buddhīndriyabalapradam//
(ityāmalakāyasaṃ brāhmarasāyanam/)
tapasā brahmacaryeṇa dhyānena praśamena ca/
rasāyanavidhānena kālayuktena cāyuṣā//
sthitā maharṣayaḥ pūrvaṃ, nahi kiñcidrasāyanam/
grāmyānāmanyakāryāṇāṃ sidhyatyaprayatātmanām//
saṃvatsaraṃ payovṛttirgavāṃ madhye vaset sadā/
sāvitrīṃ manasā dhyāyan brahmacārī yatendriyaḥ//
saṃvatsarānte paupīṃ vā māghīṃ vā phālgunīṃ tithim/
tryahopavāsī śuklasya praviśyāmalakīvanam//
bṛhatphalāḍhyamāruhya drumaṃ śākhāgataṃ phalam/
gṛhītvā pāṇinā tiṣṭhejjapan brahmāmṛtāgamāt//
tadā hyavaśyamamṛtaṃ vasatyāmalake kṣaṇam/
śarkarāmadhukalpāni snehavanti mṛdūni ca//
bhavantyamṛtasaṃyogāttāni yāvanti bhakṣayet/
jīvedvarṣasahasrāṇi tāvantyāgatayauvanaḥ//
sauhityameṣāṃ gatvā tu bhavatyamarasannibhaḥ/
svayaṃ cāsyopatiṣṭhante śrīrvedā vāk ca rūpiṇī//
(iti kevalāmalakarasāyanam/)
triphalāyā rase mūtre gavāṃ kṣāre ca lāvaṇe/
krameṇa ceṅgudīkṣāre kiṃśukakṣāra eva ca//
tīkṣṇāyasasya patrāṇi vahnivarṇāni &sādhayet/
caturaṅguladīrghāṇi &&tilotsedhatanūni ca//
&`vāpayet' iti pā-. &&`tilotsedhasamāni' iti pā-.
jñātvā tānyañjanābhāni sūkṣmacūrṇāni kārayet/
tāni cūrṇāni madhunā rasenāmalakasya ca//
yuktāni lehavat kumbhe sthitāni ghṛtabhāvite/
saṃvatsaraṃ nidheyāni yavapalle tathaiva ca//
dadyādāloḍanaṃ māse sarvatrāloḍayan budhaḥ/

Now we shall expound the quarter of rejuvenatives entitled 'Hand-Harvested'.

Having used it, the self-controlled were freed from fear of fatigue, disease, and old age;
by its power, possessed of great strength, they practiced asceticism as long as they wished.
Brahmā created this rejuvenative lasting a thousand years,
which relieves old age and disease, and confers strength upon the intellect and sense faculties.
(Thus ends the iron-and-āmalakī rejuvenative of Brahmā.)

By asceticism, celibacy, meditation, and tranquility,
by the proper use of rejuvenatives, and by an appropriate lifespan,
the great sages of old endured; for no rejuvenative succeeds
for the rustic, for those engaged in other pursuits, or for those whose minds are not self-controlled.
Subsisting on milk for a year, one should dwell always among cows,
meditating mentally on the Sāvitrī, celibate, with restrained senses.
At the end of the year, on the full-moon day of Pauṣa, Māgha, or Phālguna,
having fasted for three days of the bright fortnight, one should enter an āmalakī grove.
Having climbed a tree rich with large fruits, grasping a fruit on a branch
with one's hand, one should remain reciting the sacred syllable until the arrival of the nectar of immortality.
For at that moment the nectar of immortality surely dwells in the āmalakī for an instant;
[the fruits] become sweet like sugar and honey, oily, and soft
owing to union with the nectar of immortality. As many of them as one may eat,
for that many thousands of years one will live, restored to youth.
Having reached full repletion with them, he becomes like an immortal,
and Fortune, the Vedas, and embodied Speech attend upon him of their own accord.
(Thus ends the pure āmalakī rejuvenative.)

In the decoction of triphalā, in cow's urine, in salt-water,
and successively in the alkali of ingudī and the alkali of kiṃśuka,
one should quench sheets of sharp iron brought to the color of fire,
four finger-breadths long and as thin as the height of a sesamum seed.
Knowing them to have become dark like collyrium, one should reduce them to fine powder.
Those powders, mixed with honey and the juice of āmalakī,
resembling an electuary and kept in a pot seasoned with ghee,
should be placed for one year in a mound of barley grains.
The wise man should stir it every month, mixing it thoroughly everywhere.