How soon will I see results?

Most users report noticeable improvements in skin texture and tone within 4-6 weeks of consistent use, with full results taking up to 3 months. User results may vary.

Can I use it with retinol, niacinamide, or exfoliants?

Yes to all three. The old rule about vitamin C not mixing with niacinamide comes from a lab scenario, not a bathroom shelf — use them together freely. Retinol and exfoliants are best kept to your evening routine, with the serum in the morning. That is not a compatibility problem; it just gives each active a clean run.

What did the clinical study actually show?

We commissioned an independent 8-week clinical study at Essex Testing Clinic (34 participants). Here is everything it showed: 94% saw visibly brighter skin 94% saw faded discoloration 94% skin texture felt smoother 91% saw more even skin tone 100% skin texture felt softer 91% saw improved skin clarityAnd 0% reported irritation — across the entire 8 weeks.

Is this good for oily or acne-prone skin?

Yes. This serum is non-comedogenic and kind to acne-prone skin — it works for all skin types, and can improve the appearance of acne discoloration over time.

Why is the serum amber, and how do I know it is still good?

It arrives with a natural amber tint — that is the formula on day one, not a serum that has turned. We use sodium ascorbyl phosphate (SAP), which is more stable than L-ascorbic acid and less prone to oxidation, so it holds its potency through the bottle rather than browning on your shelf in a matter of weeks. Keep it out of direct sun, and replace it about six months after opening.

What is the consistency like?

The Vitamin C Serum is a thin, gel-like serum that absorbs quickly and easily into skin.

Can I use it twice a day?

While we recommend using it in the morning, it can also be applied at night if you are not using another serum.

Does this work well under makeup?

Yes, our lightweight, fast-absorbing formula makes it an excellent base for makeup.

Does this have a fragrance?

No synthetic fragrance — ever. What you smell is the formula itself: konjac root, chamomile and clary sage give it a faint botanical aroma that dissipates within a minute of applying. If you've been avoiding vitamin C because of the smell, this is the one to try.

Vitamin C Serum

Name: Vitamin C Serum
Brand: Mad Hippie
SKU: 13964127423
Price: 33.99 USD
Availability: InStock
Rating: 4.85 (417 reviews)

1.02 fl oz

Our best-seller and the one that started it all. A stable vitamin C serum that visibly brightens, smooths, and helps improve the look of uneven tone.

94% Saw

Faded discoloration and brighter skin

In 8 weeks Clinical study · N = 34

Visibly brightens with C + E + ferulic acid
Reduces wrinkles with SAP vitamin C
Won’t irritate with chamomile & konjac

$33.99 - One Time Purchase

60 days, money-back guarantee

$0.00 each

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One time Purchase

$33.99

each

$33.99

each

Delivered every:

30 days

Vitamin C Serum

$33.99

Absorbs in seconds.Hydrates on day one.

Dermatologist Recommended
Vegan & Cruelty-Free
No Synthetic Fragrances
Paraben & Phthalate Free

Vitamin C Serum: stable vitamin C, E + ferulic antioxidant trio; 94% saw brighter skin.

Formulated with
powerful actives

8 Actives

See what's inside

A barrier-safe form of vitamin C (SAP) that delivers visibly brighter skin and improved texture. It absorbs efficiently and is more stable than L-ascorbic acid — less prone to oxidation, so it stays potent through the bottle. Ideal for daily use, and kind to acne-prone skin.

These potent antioxidants offer a compounding effect when combined with vitamin C, improving the efficacy of the formula. Together, this gold-standard trio delivers stronger protection against oxidative stress and visibly brighter skin.

Holding up to 1000x its weight in water, this humectant binds moisture to the skin, plumping and reducing the appearance of fine lines.

These calming botanicals help soothe skin and reduce visible redness while supporting a healthy moisture barrier.

The Original Clean Skincare

Sourced responsibly &
free of harmful ingredients.

AM/PM

Cleanse → 2–4 drops on face & neck → moisturizer + SPF

Start with freshly cleansed skin.
Massage 2–4 drops into face and neck, avoiding the eye area.
Give it 30–60 seconds to fully absorb, then follow with moisturizer and broad-spectrum SPF.

Tip

Less is more — 2 drops covers most faces.

94% saw brighter skin saw brighter skin 100% skin felt softer skin felt softer 91% saw more even tone saw more even tone

Independent 8-week clinical — see all results

Using it over 5 years and nothing compares.

Clarissa B.

By the end of the bottle, my dark spots were 80% lighter — almost gone.

Donna K.

A nice glow — and my dark spots have diminished.

Maria I.

Tried expensive serums — none better. Affordable, never switching.

Rachel M.

FAQ

We commissioned an independent 8-week clinical study at Essex Testing Clinic (34 participants). Here is everything it showed:

94% saw visibly brighter skin

94% saw faded discoloration

94% skin texture felt smoother

91% saw more even skin tone

100% skin texture felt softer

91% saw improved skin clarity

And 0% reported irritation — across the entire 8 weeks.
It arrives with a natural amber tint — that is the formula on day one, not a serum that has turned. We use sodium ascorbyl phosphate (SAP), which is more stable than L-ascorbic acid and less prone to oxidation, so it holds its potency through the bottle rather than browning on your shelf in a matter of weeks. Keep it out of direct sun, and replace it about six months after opening.