Reputation for gentleness on sensitive/reactive skin
Many buyers explicitly say they sought this product after other Vitamin C serums irritated their skin, damaged their barrier, or worsened rosacea/redness.
Entry point for Vitamin C beginners
Numerous reviewers state they picked the 'gentle'/lower concentration version specifically because they were new to or scared of Vitamin C actives.
Repurchase/brand loyalty
A large share of reviews mention this being their 2nd, 3rd, or 4th bottle, or that they trust Dr. Althea overall due to positive experience with other products in the line.
Word-of-mouth and social proof
Several buyers cite friend recommendations, TikTok mentions, or general hype/positive reviews as the trigger for purchase.
Sale/price promotions
At least one reviewer mentioned buying during an Olive Young sale, suggesting promotional pricing drives conversion.