Tula bright start

Shares tranexamic acid, ferulic acid and lactic acid at presumably lower concentration in an anti-aging day cream base, but lacks the probiotic ferment complex and peptide that define Tula's formula.

Both are vitamin C serums with ferulic acid and tocopherol, but Drunk Elephant relies on straight ascorbic acid rather than the gentler ethyl ascorbic acid/tetrahexyldecyl ascorbate blend and skips tranexamic acid entirely.

It swaps Tula's 3-o-ethyl ascorbic acid and tranexamic acid for a niacinamide/ascorbyl glucoside base, so the brightening mechanism is different even though both target dark spots.

This is a sunscreen-moisturizer hybrid using sodium ascorbyl phosphate and niacinamide, not the same ethyl ascorbic acid/tranexamic acid combo that drives Tula's brightening effect.

This is a bare-bones eye serum with plain ascorbic acid and niacinamide; it doesn't actually contain the ethyl ascorbic acid or tranexamic acid the deterministic match claims, and lacks nearly all of Tula's supporting actives.