noun, noun which may take the genitive case particle 'no'
inside the body; interior of the body
Refers to the internal space or environment of a living body, often used in medical, biological, or health contexts. Can also be used figuratively for something being absorbed or present within the body.
体内時計が乱れると、睡眠の質が下がる。
When the body clock is disrupted, sleep quality declines.
この薬は体内
This medicine is designed to dissolve slowly inside the body.