Influencer/TikTok recommendation
Multiple reviewers explicitly say they bought it after seeing it recommended on TikTok or by influencers, driving trial among first-time buyers.
Brand/ingredient reputation
Many customers already used Isntree's toner or BHA and purchased the serum to complete the 'series', trusting the brand's low-molecular hyaluronic acid formulation.
Comparison shopping vs. Torriden/The Ordinary
A large number of reviewers bought it specifically to compare against or as an alternative to Torriden Dive-In or The Ordinary HA, often citing better price or lighter texture.
Repurchase loyalty
Numerous reviewers mention buying their 2nd, 3rd, or 4th bottle, citing consistent results and fear of running out as key repurchase drivers.
Promotions and value pricing
Several buyers mention purchasing during sales, promotions, or 1+1 deals, and note the large 50mL size offers good value for the price.