Ingredient reputation (glutathione + niacinamide)
Many buyers purchase specifically for the brightening/whitening reputation of glutathione and niacinamide, often mentioning they seek these ingredients to fade sun spots, tan, or dullness.
Repeat/loyal purchase
A very high number of reviews are 2nd-5th+ repurchases, with buyers saying they trust APLB more than glutathione sold locally or other brands they've tried.
Affordable price point
Reviewers repeatedly cite the low price and frequent Olive Young sales as a key reason to buy and restock, calling it the most cost-effective glutathione tablet available.
Easy, low-effort routine fit
Buyers who don't have time for long skincare routines choose this because it's a single daily tablet with no flavor, seen as an easy 'inner care' addition.
Gifting/family use
Several reviewers bought extra bottles for mothers, daughters, or coworkers after positive personal experience.