Do not take vitamin A supplements. It is risky, and processed vitamin A is not as good as natural in food.
Instead, make it a habit to consume some animal liver (like calf or lamb or chicken or turkey or pork or whatever).
Liver is the organ in animal body that contains highest levels of vitamin A.
But, there is generally some vitamin A in all meats.
If you make it a habit to consume some animal liver 2 or 3 meals per week (you can do it more often when you start, like 4 or 5 times ), your body will absorb more natural form of vitamin A and you may feel the difference.
Even fish liver contains vitamin A, like cod liver, etc. in case you do not consume mammals or birds.
Check your blood type, and look on the blood type lists too:
Like. for people of blood type O, calf liver is highly beneficial, while people of blood type A should avoid it. Other blood types can consume it, but not as often as O.
Wild fish like Cod, mackrell and wild salmon are beneficial for all blood types according to Peter:
Liver from those fish contains vitamin A, though not as much as calf liver.
Here are the nutrients found in a 3.5-ounce (100-gram) serving of beef liver (1):
Vitamin B12: 3,460% of the RDI. Vitamin B12 helps the formation of red blood cells and DNA. It is also involved in healthy brain function (2).
Vitamin A: 860–1,100% of the RDI. Vitamin A is important for normal vision, immune function and reproduction. It also helps organs like the heart and kidneys function properly (3).
Riboflavin (B2): 210–260% of the RDI. Riboflavin is important for cellular development and function. It also helps turn food into energy (4).
Folate (B9): 65% of the RDI. Folate is an essential nutrient that plays a role in cell growth and the formation of DNA (5).
Iron: 80% of the RDI, or 35% for women of menstruating age. Iron is another essential nutrient that helps carry oxygen around the body. The iron in liver is heme iron, the kind most easily absorbed by the body (6, 7).
Copper: 1,620% of the RDI. Copper acts like a key to activate a number of enzymes, which then help regulate energy production, iron metabolism and brain function (8).
Choline: Liver provides all of the Adequate Intake (AI) for women and nearly all of it for men (AI is used because there is insufficient evidence to set an RDI). Choline is important for brain development and liver function (9, 10).