3 - Topical Antioxidants

Question 1

Vitamin C (L-ascorbic acid) is a free radical scavenger and predominant cutaneous antioxidant

Answer 1

True

Question 2

Vitamin C (L-ascorbic acid) does not absorb UVA and UVB

Answer 2

True

Question 3

Vitamin C (L-ascorbic acid) in combination with Vitamin E (alpha-tocopherol) confers significant UVA and UVB protection, over either topically applied Vitamin alone

Answer 3

True

Question 4

Vitamin C (L-ascorbic acid) protects Vitamin E from oxidation

Answer 4

True

Question 5

Vitamin C (L-ascorbic acid) stimulates collagen synthesis

Answer 5

True

Question 6

Vitamin C (L-ascorbic acid) is Commonly used in the treatment of photoaging

Answer 6

True (addition of tyrosine and zinc to vitamin C provides more than 20 times the amount of vitamin C found in normal skin)

Question 7

Topical Vitamin C (L-ascorbic acid) may cause stinging, erythema and dry skin

Answer 7

True

Question 8

Vitamin E (tocopherol) is a free radical scavenger that prevents lipid peroxidation

Answer 8

True

Question 9

Vitamin E (tocopherol) may inhibit clotting and may be unwise to apply this to an open healing wound

Answer 9

True

Question 10

Selenium (L-selenomethionine) is an essential co-factor for glutathione peroxidase and thioredoxin reductase important in cellular defence against oxidative stress

Answer 10

True

Question 11

Selenium (L-selenomethionine) may be used in photoprotection

Answer 11

True

Question 12

Zinc has photoprotective and antioxidant effects

Answer 12

True