Apples, oranges, and grapefruits contain vitamin B12. Vitamin B12 is a very special vitamin that can hardly be found in vegetables. It is only found in seaweed and seaweed. In addition, vitamin B12 is also the only vitamin that contains essential minerals. It is red because it contains cobalt. It is also called a red vitamin and is one of the few colored vitamins. Liver is the best source of vitamin B12, followed by milk, meat, eggs, fish, etc. Plants do not contain vitamin B12.

Extended information:

1. Vitamin B1, also known as thiamine or anti-neuritis vitamin or anti-beriberi vitamin, is a white crystal that is easily oxidized in the presence of oxidants. Dehydrothiamine, which fluoresces blue when exposed to UV light. A B vitamin composed of a pyrimidine ring and a thiazole ring combined through a methylene group. It is white crystal or crystalline powder; it has a weak special odor, tastes bitter, and is hygroscopic. When exposed to the air, it easily absorbs moisture. It is easy to decompose and deteriorate in alkaline solution. When the pH is 3.5, it can withstand high temperatures of 100°C. When the pH is greater than 5, it will easily fail. The potency decreases when exposed to light and heat. Therefore, it should be stored in a dark and cool place and should not be stored for a long time. It is very stable in acidic solutions, unstable in alkaline solutions, and easily destroyed by oxidation and heat. Reducing substances such as sulfite and sulfur dioxide can inactivate vitamin B1.

2. Vitamin B1 deficiency can cause a variety of neuroinflammations, such as beriberi. Polyneuritis caused by vitamin B1 deficiency causes inflammation and degeneration of peripheral nerve endings in patients, accompanied by symptoms such as numbness of the limbs, muscle atrophy, heart failure, and edema of the lower limbs. Beriberi was very popular in China, Japan, and especially Southeast Asia in the 18th and 19th centuries. At that time, hundreds of thousands of people died from beriberi every year. The treatment of beriberi has long been recorded in ancient Chinese medical books. Sun Simiao, a famous Chinese doctor, is known to use rice husk to treat beriberi. In modern medicine, vitamin B1 preparations have significant effects in treating beriberi and various neuroinflammations.

3. B1 is the earliest vitamin purified by people. It was first discovered by Ickermann, a scientist from the Kingdom of the Netherlands, in 1896. It was extracted and purified from rice bran by Polish chemist Funk in 1910.

Data source: Baidu Encyclopedia: Vitamin B1