vitamin a

No summary available for this substance.

Vitamin A

Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, and several provitamin A carotenoids. It plays critical roles in maintaining healthy vision, neurological function, and skin health. It is also known for its potent antioxidant activities.

Category
Vitamin
Molecular Formula
C20H30O
Mechanism of Action
Vitamin A acts by binding to and activating retinoid receptors, influencing a variety of protein synthesis and function. It is crucial for eye health as it's converted in the retina to retinal, a chemical needed for both low-light and color vision.
Evidence Grade
A

Other Names

  • Retinol
  • Retinal
  • Retinoic Acid
  • Provitamin A Carotenoids

Primary Benefits

  • Supports eye health
  • Promotes skin health
  • Supports immune function
  • Has antioxidant activities
  • Supports bone health

Recommended Dosage

Adults 700-900 micrograms per day
Children 300-600 micrograms per day

Side Effects

  • Nausea
  • Vomiting
  • Headache
  • Dizziness
  • Blurry vision

Precautions

  • Avoid high doses during pregnancy
  • People with liver disease should consult a healthcare professional before use

Interactions

  • Interacts with certain medications like Orlistat and other weight-loss drugs
  • Interacts with certain anti-acne medications

Key References

  • https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
  • https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3936685/
How to Optimize Female Hormone Health for Vitality & Longevity | Dr. Sara Gottfried
Optimizing Women's Health: Hormones, Nutrition, Exercise, and Genetics Insights 37:44 0
“What I like to do with nutritional testing is run a panel that's looking at antioxidants like vitamin A, vitamin C, Alpha lipoic acid, plant-based antioxidants. You can measure that in the blood.”

No comments yet.

View all comments (0)
Bruce Ames on Triage Theory, Longevity Vitamins & Micronutrients
Understanding Nutritional Essentials for Optimal Health and Longevity 40:41 0
“I know I was recently looking at my multivitamin, and I saw that for vitamin A, which, as you mentioned, beta carotene is a carotenoid that can be converted into vitamin A, that, you know, the vitamin A source was beta carotene.”

No comments yet.

View all comments (0)
Courtney Swan: Why Your ‘Healthy’ Food Is Actually Harmful | TUH #171
Understanding Dietary Misconceptions, Health Implications, and Consumer Empowerment 17:15 0
“Masa chips are crafted with grass-fed beef tallow, one of the healthiest fats on the planet. These chips are packed with essential vitamins like vitamin A, D, E, and vitamin K2.”

No comments yet.

View all comments (0)
The Shady Reality of the $Billion Supplement Industry | The Dr. Hyman Show
Understanding Supplement Quality, Nutrition Myths, and Modern Health Realities 42:17 0
“in the fats soluble vitamins like AD, D, E, K, you know, should be taken with a meal to help improve absorption and it can impact it by up to 50%. With fatty foods, fatty foods particularly, right?”

No comments yet.

View all comments (0)
How to Improve Your Eye Health & Offset Vision Loss | Dr. Jeffrey Goldberg
Enhancing Eye Health Through Lifestyle Choices and Preventative Measures 2:48:10 0
“Great, we've all heard that carrots are good for our vision which presumably stems from some peripheral understanding about the fact that vitamin A is integral to the photosynthesis pathway of converting light into electrical and chemical signals that the rest of the ion brain can use.”

No comments yet.

View all comments (0)
How to Improve Your Eye Health & Offset Vision Loss | Dr. Jeffrey Goldberg
Enhancing Eye Health Through Lifestyle Choices and Preventative Measures 2:52:51 0
“it turns out that the beta katene they noted a little bit of an increased cancer risk in the patients in the arids one who had that beta keratin mostly in patients who are smokers”

No comments yet.

View all comments (0)
Zone 2 Training: The Science Behind Peak Metabolic Health | Dr Inigo San Millan | The Proof Podcast
Enhancing Metabolic Health Through Exercise: Complete Guide for Beginners 2:32:56 0
“I think that we have to be careful with some of these supplements which more and more are sophisticated and can really do biological actions more than just having like the typical vitamin C or vitamin A or even D.”

No comments yet.

View all comments (0)