This tonic serves to vitalise your hairs.

Answer: Option B

Vitalise : give strength and energy to.
Shorten : make or become shorter.
Enfeeble : make weak or feeble.
Repress : subdue (someone or something) by force.
Clamour : a loud and confused noise, especially that of people shouting.

Antonym of Vitalise is Enfeeble