Acne and oily-skin reputation
Many buyers purchased specifically because the serum is widely known/recommended for acne-prone, oily, and sebum-heavy skin, often citing word-of-mouth or online buzz.
Repurchase/loyalty
A large share of reviews are repeat purchases (2nd, 3rd, even 11th bottle), showing strong brand loyalty and habitual restocking behavior.
Influencer/social media recommendation
Several reviewers explicitly mention buying due to TikTok, YouTuber, or 'famous' reputation, indicating social media is a key purchase driver.
Hyaluronic acid serum replacement
Multiple reviewers say they bought it to replace their HA serum, valuing it as a lighter, equally hydrating alternative.
Line/set purchase with cream or toner pads
Some buyers purchased the serum as part of the No.1 line (toner pads, cream, powder), suggesting cross-sell potential within the product family.