A gel fiber manufacturing apparatus includes: a first ejection portion configured to eject a main liquid containing a core liquid; a second ejection portion provided to surround a radially outer side of the first ejection portion and configured to eject a sheath fluid that hardens the core liquid; and a sheath fluid supply portion configured to alternately apply to the sheath fluid a constant pressure and a high pressure to supply the sheath fluid to the second ejection portion, the high pressure being higher than the constant pressure.

Provided is a method for enhancing anti-oxidative ability, anti-bacterial ability, anti-inflammatory ability and/or anti-allergic ability of a textile. The method comprises adding a cannabidiol in an alginate fiber comprising cannabidiol, wherein the textile comprises a yarn comprising the alginate fiber comprising cannabidiol, the alginate fiber comprising cannabidiol comprises the cannabidiol and an alginate, and the cannabidiol disperses in the alginate fiber comprising cannabidiol.

Provided is a method for enhancing anti-oxidative ability, anti-bacterial ability, anti-inflammatory ability and/or anti-allergic ability of a textile. The method comprises adding a cannabidiol in an alginate fiber comprising cannabidiol, wherein the textile comprises a yarn comprising the alginate fiber comprising cannabidiol, the alginate fiber comprising cannabidiol comprises the cannabidiol and an alginate, and the cannabidiol disperses in the alginate fiber comprising cannabidiol.