A couple of questions

What percentage of vitamin C is effective?

For a vitamin C serum to be effective, it should ideally have a concentration between eight and 20 percent. The higher the concentration, the more potent it is. Serums with vitamin C concentrations below eight percent are ineffective, while above 20 percent, their effectiveness tapers off.24 Feb 2021

What percent vitamin C serum is the most effective?

Concentration: The sweet spot for the concentration level is between 10 and 20 percent. You definitely want a concentration that's higher than 8 percent for maximum effectiveness. But going over 20 percent could lead to irritation and doesn't increase its benefit.

What is the effectiveness of vitamin C?

Vitamin C is one of the safest and most effective nutrients, experts say. Though it may not be the cure for the common cold, the benefits of vitamin C may include protection against immune system deficiencies, cardiovascular disease, prenatal health problems, eye disease, and even skin wrinkling.

Which vitamin C is best for skin?

Check the label for L-ascorbic acid, which is considered to be the vitamin C that's best for skin. (Even better: If it contains 15 to 20 percent L-ascorbic acid, which is the most effective.) "Vitamin C is notoriously unstable—especially when it's exposed to air and light," says Jackson.

How strong should vitamin C be?

For adults, the recommended daily amount for vitamin C is 65 to 90 milligrams (mg) a day, and the upper limit is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, megadoses of vitamin C supplements might cause: Diarrhea. Nausea.

Can I use vitamin C serum everyday?

How to Use a Vitamin C Serum and Reap Its Benefits. Saedi says to apply a few drops of serum to your face after you wash and dry it. “A little bit goes a really long way,” she says. She recommends putting it on every morning, all year round.

Who should not use vitamin C serum?

The top ingredients you should never pair with vitamin C serums are retinol, AHAs and BHAs, benzoyl peroxide and niacinamide. 3) What are some Vitamin C storage mistakes people tend to make?

How long does 500mg of vitamin C stay in system?

Vitamin C can stay in the body for weeks. Levels of vitamin C in the blood are controlled by the kidneys through a process known as 'renal reabsorption,' which prevents vitamin C from being lost in the urine.