Ascorbic Acid

Ascorbic Acid

CAS No.: 50-81-7
EINECS No. 200-066-2
Molecular Formula: C6H8O6
Molecular Weight: 176.12
Synonyms: Vitamin C

l-ascorbic acid


Test Item Specification
Characteristics White or almost white crystals crystalline powder
Identification Positive reaction
Melting point About 190℃
PH (with 2% water solution) 2.4-2.8
Ph (with 5% water solution) 2.1-2.6
Clarity of solution Clear
Color of solution ≤BY7
Copper ≤5ppm
Heavy metals ≤10ppm
Mercury ≤0.1mg/kg
Lead ≤2mg/kg
Arsenic ≤3ppm
Oxalic Acid ≤0.2%
Iron ≤2ppm
Impurity E ≤0.2%
Loss of drying ≤0.4%
Sulphate ash (residue on ignition) ≤0.1%
Specific Optical Rotation +20.5–+21.5
Residual solvents Pass
Assay 99.0%–100.5%



Ascorbic Acid powder, known as Vitamin C, E300, Food antioxidant, Ascorbic acid is a water-soluble, sugar-based acid with strong antioxidant properties.

Ascorbic Acid can be used in Food, Beverage, Pharmaceutical, Health & Personal care products, Agriculture/Animal Feed/Poultry. Ascorbic Acid is often used as an antioxidant in food preservation, meat products, fermented flour products, beer, tea, fruit juices, canned fruit, and canned meat. Ascorbic Acid can also be used as a nutritional supplement.

Ascorbic acid—also known as L-ascorbic acid—has the most research of any form of vitamin C when it comes to skin, and in fact is the most abundant naturally occurring antioxidant in our skin. Concentrations between 5–20% can improve numerous the appearance of signs of aging, including discolorations, wrinkles, and loss of firmness due to sun damage. Lower concentrations such as those between 0.3–2% also offer benefits, such as improvement of uneven skin tone, fine lines, and boosting skin’s antioxidant supply.

Ascorbic acid is also a powerhouse when mixed with other antioxidants, especially vitamin E, and is particularly great for evening out skin tone when used alone in higher concentrations, such as 15%, 20%, or greater. Vitamins C and E work together to keep each other stabilized and able to exert their benefits in skin longer.

In order to be most effective in higher concentrations, any water-based vitamin C formula’s pH should be 3.5 or lower. This helps improve stability and permeability of ascorbic acid, allowing it to do more than work as an antioxidant.

Ascorbic acid is a particularly vulnerable antioxidant when exposed to UV light and air, so it must be packaged to protect it from these elements during routine use. If not, its effectiveness will gradually become diminished to the point of not working at all. You will see this as discoloration from oxidation which causes the product to turn a copper to brownish color. For this reason, avoid any vitamin C (ascorbic acid) products packaged in traditional, open-mouthed jars or clear bottles.

Dropper-based dispenser-type packaging should also have air-restrictive capabilities to improve stability. And for maximum potency, it’s best to use a water-based vitamin C treatment within 3 months of opening. With once-daily usage, most people will find they go through their vitamin C product within a couple months.

Considered safe as used in cosmetics, ascorbic acid is also fine to use with retinol and niacinamide without any of these ingredients causing the other to break down or lose effectiveness beyond what would normally occur due to air and light exposure, which is why ingredients like these need to be routinely applied.


    Standard packaging includes the following:

25kg per drum


Store in a well-ventilated, cool, dry area, out of direct sunlight. Keep containers tightly closed when not in use.


36 months