Glutathiosome Dark Spot Serum Vita Drop
Reviewed by SerumTruth Editorial · Updated July 2026
Niacinamide is the genuine active in this dark-spot serum, well-positioned on the label even without a printed percentage. The glutathione, vitamin C trio and centella touches that build the marketing story all read as trace, fairy-dusted amounts, so treat this as a solid niacinamide brightening serum wearing a bigger ingredient story than the label supports. The clear dropper is not doing the fragile actives any favors either. Fair for the niacinamide alone, not for everything the name promises.
- Evidence24 / 30
Strength of the research behind the key actives
- Niacinamide: moderate evidence
- Tranexamic Acid: moderate evidence
- Vitamin C (L-Ascorbic Acid): strong evidence
The average of the key actives’ evidence grades.
- Potency17 / 25
Dosed at studied levels, not fairy-dusted
- Niacinamide: dosed at a studied level
- Tranexamic Acid: below the 1% line, treated as fairy-dusted
- Vitamin C (L-Ascorbic Acid): below the 1% line, treated as fairy-dusted
How strongly the actives are dosed, led by the strongest, not how many there are.
- Delivery & stability6 / 20
Delivery tech + packaging that protects fragile actives
- Delivery: standard
- Packaging: clear dropper
- Air- or light-sensitive actives (Vitamin C (L-Ascorbic Acid)), so packaging is scored.
Delivery tech plus packaging, and packaging only counts when actives are fragile.
- Formulation3 / 10
Disclosure, active breadth, and ingredient generation
- 0 of 3 actives disclose a concentration
- 3 key actives (breadth credit caps at 3)
- Current-generation or synergistic: Tranexamic Acid
Disclosure, active breadth, and current-generation or synergistic actives.
- Value14 / 15
What a month of use costs vs. the category
- About $12 per month to use
- $32 for 50 ml, used about twice a day (about 0.3 ml each time), so a bottle lasts about 2.8 months
What a month of use costs: full marks at $6 a month or less, the floor at $60 a month or more.
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What’s inside
| Active | Disclosed | Dose |
|---|---|---|
| Niacinamide | n/a | Studied |
| Tranexamic Acid | n/a | Below 1% line |
| Vitamin C (L-Ascorbic Acid) | n/a | Below 1% line |
Niacinamide carries no printed percentage, but it sits third on a 42-ingredient label, ahead of glycerin and every humectant on the list, a strong sign of a genuinely dosed brightening active rather than a token amount. Glutathione, the 'Glutathiosome' of the name, has no dedicated slug in this catalog, so it is mapped here to tranexamic acid as the closest cataloged pigment-focused amino-acid derivative for scoring purposes; the real ingredient is a tripeptide antioxidant, not tranexamic acid, and on the label it sits well down the list alongside madecassoside, closer to a finishing touch than a headline dose. Three separate vitamin C forms (ascorbic acid, 3-O-ethyl ascorbic acid and ascorbyl glucoside) are stacked back to back near the tail of the label as well, a classic fairy-dusting pattern rather than a dosed vitamin C serum. Packaged in a frosted glass dropper, a real weak point for the ascorbic acid and glutathione, both of which are prone to oxidizing with light and air exposure even at the modest levels used here.
How it’s delivered
Air- and light-sensitive actives (vitamin C, copper peptides) lose potency fast in the wrong packaging, so delivery and the bottle are scored, not just what’s on the label.
The actives, explained
Cosmetic information for general education, not medical advice. The SerumProof score reflects our reading of publicly available research and formulation disclosures. See how scoring works.