as per section 7(c) of cgst act 2017, supply includes activitites specified in schedule 1 made without considieration. schedule 1 pont 2- where there is a supply of gopds and services to related one or disitinct person in furthwrence of business.
so if u r supply free samples to customers and u r taxable person, then as per section 7 c schedule 1 point 2 ot is a supply and Gst is applicable om such supply provided u r not fall on scetion 22 or 24 of CSGST act