Complete the sentences about vitamins with the words from the box. One word is used twice.

1. Vitamin A keeps the... healthy and is important for good vision. It is found in fatty foods like butter, cheese, whole milk and yo­ghurt.

2. Vitamin A, and more specifically, retinoic acid, appears to main­tain normal... health by switching on genes and differentiating keratinocytes (immature skin cells) into mature epidermal cells.

3. The В vitamins keep the... healthy and help reduce.... They are found in foods like whole-grain bread and cereals.

4. Vitamin B₉ is needed before and during.... It is present mainly in green leafy vegetables and legumes.

5. The primary role of vitamin B₆ is to act as a coenzyme to many other... in the body that are involved predominantly in....

6. Vitamin B₁₂ is a water-soluble vitamin with a key role in the nor­mal functioning of the... and nervous system, and for the forma­tion of....

7. Vitamin С is needed to help the... repair itself when it is damaged. It is found in fruit, especially citrus fruit and kiwifruit.

8. Vitamin D is needed for healthy bones and... because it helps the body absorb calcium. Our body makes vitamin D when our... is exposed to....

9. Vitamin E can be found most abundantly in wheat germ oil, and in sunflower or soybean oils. It is a fat-soluble... that stops the production of reactive oxygen species formed when fat undergoes oxidation.

10. Deficiency of vitamin E is very rare but mild... in newborn infants may occur.

11. Vitamin K₁ is found chiefly in leafy green vegetables such as spi­nach, cabbage, cauliflower and broccoli; some fruits such as avo­cado, kiwifruit and grapes are also high in vitamin K.

12. Many bacteria, such as Escherichia coli found in the..., can syn­thesize vitamin К₂, but not vitamin K_1.