Goodbye, Vitamin by Rachel Khong

Synopsis (via Goodreads):

Goodbye Vitamin

 

Goodbye, Vitamin is the wry, beautifully observed story of a woman at a crossroads, as Ruth and her friends attempt to shore up her father’s career; she and her mother obsess over the ambiguous health benefits – in the absence of a cure – of dried jellyfish supplements and vitamin pills; and they all try to forge a new relationship with the brilliant, childlike, irascible man her father has become.