May cause poisoning.

Excessive intake of vitamin D can increase blood calcium concentration, excessive calcium deposition in bones, and calcification of kidneys and other organs. It is characterized by loss of appetite, excessive thirst, nausea, vomiting, irritability, weakness, alternating occurrence of constipation and diarrhea, and in severe cases, death due to renal calcification, heart and aorta calcification.

Vitamin D3 (cholecalciferol) is mainly synthesized by the human body itself. The human skin contains a type of cholesterol, which turns into vitamin D3 after exposure to sunlight. Therefore, if the child can fully receive direct sunlight on the skin for more than 4-6 hours, the vitamin D3 synthesized by itself will basically be sufficient.

Sea liver is the most abundant source of vitamin D3. For example, cod, halibut and swordfish livers contain 200-750 micrograms, 500-10,000 micrograms and 25,000 micrograms of vitamin D3 per 100 grams respectively. Others such as herring, salmon, sardines and pomfret whales contain small amounts;

Poultry livers, eggs and milk also contain small amounts, with the content below 100 micrograms per 100 grams. Under normal circumstances, it is not easy to obtain enough vitamin D3 from food alone, so the synthesis of vitamin D3 in the body through sunbathing is a particularly important way.

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Extended information:

Cholecalciferol 25-Hydroxycholate is formed in the liver through the action of the hydroxylase system Calciferol is then hydroxylated in the kidneys to 1,25-dihydroxycholecalciferol, which is 50% more active than cholecalciferol and is proven to be the true active form of vitamin D in the body. Mary Kay Yiri Peptide Solid Drink contains this ingredient.

And 1,25-dihydroxycholecalciferol is a hormone secreted by the kidneys, so cholecalciferol is actually a prohormone. At the same time, vitamin D is a fat-soluble vitamin and is also regarded as a hormone precursor that acts on calcium and phosphorus metabolism. It is closely related to sunlight, so it is also called the "sunshine vitamin".

/baike.baidu.com/item/E7BBB4E7949FE7B4A0D3/1276466?fr=aladdin#1_7"target="_blank"title="Baidu Encyclopedia-Vitamin D3"gt; Baidu Encyclopedia-Vitamin D3