10% Vitamin C-Glutathione Advanced Brightening Serum

Ans: Glutathione is a powerful antioxidant that fades pigmentation and brightens skin tone. Its topical application also helps with cellular repair and regeneration for your skin.

Ans: Vitamin C and Glutathione are two of the most studied brightening antioxidants in skincare, but what makes them genuinely powerful is how they amplify each other.

Vitamin C works by inhibiting the enzyme tyrosinase, which is responsible for melanin production. This directly reduces the formation of dark spots and pigmentation. Glutathione works through a complementary but different pathway, it shifts melanin synthesis away from darker eumelanin toward lighter phaeomelanin, and simultaneously neutralises free radicals that contribute to uneven skin tone.

When used together, they target pigmentation from two angles at the same time, which is why the combination delivers faster, more visible brightening than either ingredient alone. Glutathione also helps regenerate and extend the activity of Vitamin C in the skin, meaning your Vitamin C keeps working longer. The result is a formula that does not just brighten, it maintains that brightness.

Ans: In our 15% Vitamin C Serum, we use pure L-Ascorbic Acid, the most potent and direct form of Vitamin C. For the Vit C-Gluta Advanced Brightening Serum, we use Ethyl Ascorbic Acid (3-O-Ethyl Ascorbic Acid) for a specific formulation reason: compatibility with Glutathione.

Pure L-Ascorbic Acid requires a very low pH (2.5–3.5) to remain stable and effective. Glutathione, however, is most effective at a near-neutral pH. Combining both in the same formula at L-Ascorbic Acid's required pH would compromise the Glutathione's efficacy.

Ethyl Ascorbic Acid (EAA) is a stable Vitamin C derivative that remains effective across a wider pH range, which allows both actives to coexist in one formula without either being weakened. EAA is also soluble in both water and oil, enabling it to penetrate the skin more effectively. Once absorbed, EAA is converted into pure Vitamin C inside the skin, delivering the same core benefits, brightening, collagen support, and dark spot reduction, while remaining gentle enough for daily use alongside Glutathione.

Ans: The serum is designed to work on eight interconnected skin concerns:

1. Dullness: restores radiance by neutralizing oxidative stress
2. Dark spots: from sun exposure or post-acne marks
3. Pigmentation: reduces existing melanin deposits
4. Melasma: targets stubborn hormonal pigmentation
5. Uneven skin tone: evens out patchy, discoloured areas
6. Dehydration: hydration boosters support a plump, dewy appearance
7. Early signs of ageing: antioxidant protection prevents collagen breakdown
8. Boost glow: long-term use helps maintain baseline radiance

Most users notice a visible improvement in brightness and overall glow within 3 days of consistent use. This early result is driven by Vitamin C's antioxidant action, which quickly addresses oxidative dullness caused by pollution and UV exposure.

Deeper results, reduction in dark spots, pigmentation, and melasma, are typically noticeable after 4 to 6 weeks of daily morning and night use.

Consistency is the single most important factor. Always follow with a broad-spectrum SPF 50 Sunscreen or higher during the day, since UV exposure directly counteracts the depigmenting effects of both Vitamin C and Glutathione.

Ans: Yes. The lightweight gel-cream texture is specifically designed to be breakout-safe and suitable for all skin types.

1. Oily and acne-prone skin: Non-comedogenic base absorbs quickly without clogging pores.
2. Dry skin: Hydration boosters deliver moisture alongside brightening actives.
3. Sensitive skin: Ethyl Ascorbic Acid is gentler than pure L-Ascorbic Acid and is less likely to cause tingling or redness.

A patch test is still recommended if you have reactive skin, apply a small amount on the inner arm and wait 24 hours before full facial application.

Ans: Niacinamide can be safely layered with this serum. The combination of Vitamin C, Glutathione, and niacinamide provides a complementary brightening effect, each working on a different step of the melanin production pathway.

Retinol should be used separately. Use the Foxtale Vitamin C-Glutathione Serum in the morning (followed by SPF), and apply retinol at night. Combining retinol and Vitamin C derivatives in the same step can cause irritation and reduce the efficacy of each active.

Avoid using alongside AHA/BHA exfoliants in the same step. If you use an exfoliating toner or acid serum, apply it at a different time of day.

Ans: Yes, topical Glutathione has clinical evidence supporting its role in skin brightening. It works through two mechanisms:

1. It inhibits tyrosinase activity (the same enzyme Vitamin C targets), reducing new melanin formation.
2. It shifts the type of melanin produced, from darker eumelanin to lighter phaeomelanin, leading to overall brightening of skin tone over time.
3. Glutathione is also known as the body's "master antioxidant" because it helps regenerate other antioxidants, including Vitamin C. This is why the Vitamin C + Glutathione combination delivers compounding brightening results, they reinforce each other's mechanisms rather than working in isolation.

Ans: Store the Vitamin c - Glutathione serum in a cool, dry place away from direct sunlight and heat. Both Vitamin C and Glutathione are sensitive to light and air exposure.

A slight yellowing of the formula over time is normal and does not indicate the product is unsafe. However, if the serum turns a deep orange or brown, the Vitamin C component has begun to oxidise and potency may be reduced.

Always close the cap tightly after use. A bathroom with high humidity can accelerate oxidation, a bedside drawer or cabinet is preferable for storage.