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Vitamin A toxicity is a rare concern associated with high levels of vitamin A over prolonged periods of time. Symptoms may include nausea, vomiting, headache, dizziness, irritability, blurred vision, and a lack of muscle coordination. [32] However, when administered in the correct dose, vitamin A is generally safe and effective. [30]
Vitamin A status involves eye health via two separate functions. Retinal is an essential factor in rod cells and cone cells in the retina responding to light exposure by sending nerve signals to the brain. An early sign of vitamin A deficiency is night blindness. [6] Vitamin A in the form of retinoic acid is essential to normal epithelial cell ...
Tolerable upper intake levels (UL), to caution against excessive intake of nutrients (like vitamin A and selenium) that can be harmful in large amounts. This is the highest level of sustained daily nutrient consumption that is considered to be safe for, and cause no side effects in, 97.5% of healthy individuals in each life stage and sex group.
If you're hoping to reap more of these benefits by taking a higher-than-recommended dose of vitamin c, don't bother — it's water-soluble, so you’ll pee out excess amounts. Vitamin D
2. Vitamin B12. One of eight B-complex vitamins, vitamin B12 is found naturally in some types of fish, red meat and fortified foods.It plays a key role in central nervous system function, DNA ...
While the actual amount and %DV of vitamin D, calcium, iron, and potassium must be listed, other vitamins and minerals may be listed voluntarily by the manufacturer. However, they are required to list any vitamins and minerals that are added to the food or if a statement is made on the package labeling about their health effects or the amount ...
Taking vitamin D supplements did not result in a “significantly lower risk” of fractures among middle-age and older adults in one study published in 2022 in the New England Journal of Medicine.
Retinol, also called vitamin A 1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [3] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes , immune function and reproductive development. [ 3 ]
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