Vitamin C serums tend to "go bad" after a relatively short amount of time. Has anyone had this problem with this product before using it all?

Since the company is no longer family owned, and instead owned by a multi million dollar corporation, the products are inferior; Can't exactly figure out why because the ingredients "supposedly" have not changed, however it's very clear when using the products, that something is off, because no results, no nothing, completely worthless😭 Whereas before I would see immediate results, I was a repeat customer because I could see the positive impact this line had on my skin.But now they lost me.

Can you use this in conjunction with the hyaluronic acid and if so should they be applied at separate times?

Hyaluronic acid and Vitamin C are fine to mix. One after the other is fine, I often do vitamin c first and allow it to dry slightly and then add the hyaluronic acid afterwards. I would say google is your best friend here, there are so many articles that can help address these questions for the different skin types. But these two should be a okay to use together, even positive to use together.

how long does it take to start seeing results (decreasing appearance of sunspots)?

After about 10-14 days I started to notice a more even skin tone. Make sure to cleanse and dry the area of application well first so the serum will absorb better.

20% of a 2% solution is .4% MAP?

We use 2% pure vitamin c (MAP) concentrate in our serums. Thanks!

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Asterwood Vitamin C Serum for Face with Hyaluronic Acid 1 Fl Oz | Stable Vitamin C (MAP) & Vegan Hyaluronic Acid, Supports More Even Complexion & Collagen Production, Fragrance-Free

Product ID: 30822024

Details

Product Benefits
Brightening
Scent
Fragrance Free
Skin Type
All
Special Ingredients
Hyaluronic C
Use for
Face Neck

⚡10% Stable MAP Vitamin C

🌱Vegan & cruelty-free formula

💧30ml hydrating serum

Description

✨ Glow like you mean it — the serum every skin-savvy pro swears by! 💼

ACNE SCAR RENEWAL - Accelerates skin healing by stimulating fibroblast activity and boosting collagen production.
GENTLE FOR EVERY SKIN - Lightweight, fragrance-free, and oil-free formula perfect for sensitive, oily, and dry skin types alike.
CLEAN BEAUTY COMMITMENT - Free from parabens, sulfates, synthetic dyes, and cruelty—pure skincare you can trust daily.
YOUTHFUL RADIANCE BOOST - Deep hydration with vegan hyaluronic acid plumps and smooths fine lines for visibly younger skin.
TARGETED DARK SPOT DEFENSE - Powerful stable Vitamin C (MAP) penetrates deeply to fade hyperpigmentation and even skin tone.

Asterwood Vitamin C Serum combines 10% stable MAP Vitamin C with vegan hyaluronic acid in a 30ml fragrance-free formula designed to brighten, hydrate, and support collagen production. This lightweight, oil-free serum targets dark spots, fine lines, and acne scars while being safe for all skin types. Packaged in an airtight, dark bottle to preserve potency, it’s a clean, cruelty-free essential for a radiant, even complexion.

Specifications

ASIN	B01GVUZODA
ASIN	B01GVUZODA
Active Ingredients	hyaluronic_acid, vitamin_c
Best Sellers Rank	#39,041 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #802 in Facial Serums
Brand Name	Asterwood
Customer Reviews	4.5 4.5 out of 5 stars (1,594)
Global Trade Identification Number	00850060731242
Item Form	Serum
Item Volume	30 ml
Item Weight	1 ounces
Item model number	Vitamin C Serum 1 oz
Manufacturer	Asterwood Naturals
Manufacturer	Asterwood Naturals
Manufacturer Part Number	Vitamin C Serum 1 oz
Material Features	Cruelty Free, Fragrance Free, GMO Free, Gluten Free, Vegan
Material Type Free	Alcohol Free, Dye Free, Paraben Free, Phthalate Free, Sulfate Free
Model Number	Vitamin C Serum 1 oz
Number of Items	1
Package Dimensions	4.13 x 1.38 x 1.34 inches; 1 ounces
Product Benefits	Brightening, Clearing, Even Toning, Exfoliating, Glow, Hydrating
Recommended Uses For Product	Brightening, Clearing, Even Toning, Exfoliating, Glow, Hydrating
Scent Name	Fragrance Free
Skin Tone	All
Skin Type	All
Special Ingredients	Hyaluronic Acid, Vitamin C
Target Use Body Part	Face, Neck
UPC	850060731242
UPC	850060731242
Unit Count	1 Fluid Ounces

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