22/11/2025
And there may lie the answer to my issue, and a preferred choice to regularly upgrading the prescription lenses in my glasses at $1000 a time.
Thank you William Wallace
A "simple" guide to vitamin A
Vitamin A is essential for vision, immunity, skin, and growth. Your body can get it directly from animal foods, or make it from plant pigments like β-carotene. Here’s how it works:
1️⃣ Where It Comes From
Vitamin A (retinol, retinyl esters): in milk, butter, liver, kidneys, eggs, cod liver oil.
β-carotene (pro-vitamin A): in carrots, sweet potatoes, leafy greens, apricots, tomatoes.
🟢 Example: Carrots don’t have vitamin A directly — your body converts their orange pigment (β-carotene) into vitamin A.
2️⃣ Absorption
Vitamin A and β-carotene are fat-soluble, so they need bile and pancreatic enzymes to be absorbed in the intestine.
🟢 Example: Eating carrots with olive oil boosts absorption of β-carotene.
3️⃣ Conversion and Storage
Inside intestinal cells, vitamin A is esterified and sent to the liver.
β-carotene is split and converted into vitamin A (a process supported by thyroid hormones).
The liver stores vitamin A and releases it into the blood as needed.
🟢 Example: The liver is like your vitamin A “bank account,” saving it for when intake is low.
4️⃣ What It Does
Vitamin A supports vision (especially night vision), skin integrity, growth, and immune function.
5️⃣ What Happens if You’re Deficient
Night blindness (trouble seeing in low light).
Xerophthalmia (dry, damaged eyes, Bitot’s spots).
Growth impairment.
Hyperkeratosis (rough, scaly skin).
🟢 Example: Night blindness was one of the earliest signs of vitamin A deficiency discovered in history.
You get vitamin A directly from animal foods or indirectly from plants as β-carotene. It’s absorbed with fat, stored in the liver, and essential for healthy vision, growth, skin, and immunity. Deficiency can cause serious eye problems and impaired growth.