The second portion called ‘poshaka rasa’ is carried forward to nourish the next dhatu i.e.rakta. [Cha.Sa. Chikitsa Sthana 15/16]
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During the metabolic process, this rasa is transformed into rakta dhatu by action of ranjaka pitta. It acquires a red colour during this process. This metabolism takes place at yakrit (liver) and pliha(spleen). [Su. Sa. Sutra Sthana 14/4]