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Having lower levels of lutein and zeaxanthin within the macula may be associated with an increase in the risk of age-related macular degeneration. [105] Lutein and zeaxanthin act as antioxidants that protect the retina and macula from oxidative damage from high-energy light waves. [ 106 ]
The specific vitamins and minerals in AREDS-1 are vitamin C (500 mg), zinc (80 mg), vitamin E (400 IU), copper (2 mg) and beta-carotene (15 mg). In the AREDS-2 formulation, lutein (10 mg) and zeaxanthin (2 mg) replaced beta-carotene due to the risk of lung cancer in smokers taking beta-carotene. [ 2 ]
The international unit measurement was used by the United States in 1968–2016. 1 IU is the biological equivalent of about 0.667 mg d (RRR)-alpha-tocopherol (2/3 mg exactly), or of 0.90 mg of dl-alpha-tocopherol, corresponding to the then-measured relative potency of stereoisomers.
The average daily intake of β-carotene is in the range 2–7 mg, as estimated from a pooled analysis of 500,000 women living in the US, Canada, and some European countries. [21] Beta-carotene is found in many foods and is sold as a dietary supplement. [8] β-Carotene contributes to the orange color of many different fruits and vegetables.
A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...
Leucine (symbol Leu or L) [3] is an essential amino acid that is used in the biosynthesis of proteins.Leucine is an α-amino acid, meaning it contains an α-amino group (which is in the protonated −NH 3 + form under biological conditions), an α-carboxylic acid group (which is in the deprotonated −COO − form under biological conditions), and a side chain isobutyl group, making it a non ...
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