Loyalty to the original Birch Juice sunscreen line
Many buyers already used and loved Round Lab's original Birch Juice moisturizing sunscreen or cream and purchased this serum version to try a lighter alternative.
Positive word-of-mouth and social proof
Reviewers frequently mention buying after seeing good reviews, YouTube recommendations, or friends' endorsements of the product.
Bundle value and promotions
The 50ml+50ml plus 8ml bonus set and frequent sale/coupon pricing were cited as reasons for purchase, with several calling it 'affordable' or 'great value.'
Gifting for family members
Several reviewers bought the product for mothers, husbands, daughters, or teens with different skin types, citing its gentle, non-greasy formula as suitable for sharing.
Suitability for sensitive/acne-prone skin
Buyers with rosacea, sensitive skin, or acne-prone/oily skin sought this out specifically for its reputation as non-irritating and non-comedogenic.