Vitamin A (VA)
- Deficiency Symptoms
Mild deficiency may cause night blindness, dry skin, and increased susceptibility to infections. Severe, long-term deficiency can lead to xerophthalmia (dry eyes progressing to corneal ulceration and blindness), growth retardation in children, and impaired reproductive function. Deficiency is more common in regions with limited access to animal products and diverse fruits/vegetables.
- Toxicity
Unlike water-soluble vitamins, excess vitamin A accumulates in the liver, leading to hypervitaminosis A. Acute toxicity (from very high doses in a short time) can cause nausea, vomiting, headache, and blurred vision. Chronic toxicity (from long-term high-dose supplementation) may result in bone pain, hair loss, liver damage, and birth defects in pregnant women. Provitamin A carotenoids have low toxicity risk, as the body limits their conversion to retinol; excess intake may only cause harmless skin discoloration (carotenemia).
Recommended Intake
| Company Name | Weifang Shanghe Trading Co., Ltd. | Country/Region | China |
| Business Type | business_type_options | Company Size | 1 |
| Established | March 29, 2024 | ||
| Address | |||
| Main Products | Weifang Shanghe Trading Co., Ltd. was established on March 29, 2024, with its registered address at Room 2209, Building 1, No. 13600 Jiankang East Street, Liyuan Subdistrict, Kuiwen District, Weifang City, Shandong Province. The legal representative is Qin Changqing. The business scope includes general projects: wholesale of hardware products; sales of knitted textiles and raw materials; import and export of goods; import and export of technology; technical services, development, consulting, exchange, trans | ||
Weifang Shanghe Trading Co., Ltd. was established on March 29, 2024, with its registered address at Room 2209, Building 1, No. 13600 Jiankang East Street, Liyuan Subdistrict, Kuiwen District, Weifang City, Shandong Province. The legal representative is Qin Changqing. The business scope includes general projects: wholesale of hardware products; sales of knitted textiles and raw materials; import and export of goods; import and export of technology; technical services, development, consultation, exchange, transfer, and promotion; domestic trade agency; information consulting services (excluding licensed information consulting services); socio-economic consulting services; international freight forwarding; trade brokerage; retail of hardware products; sales of non-ferrous metal alloys; sales of metal materials; sales of chemical products (excluding licensed chemical products); sales of rubber products; retail of edible agricultural products; general cargo warehousing services (excluding items requiring licensed approvals such as hazardous chemicals); sales of rare earth functional materials; sales of pulp; sales of timber; sales of agricultural and sideline products; sales of cement products; sales of building materials; import and export agency; food sales (only pre-packaged food); sales of steel products for construction; sales of doors and windows; construction of metal doors and windows; operation of wires and cables; sales of power distribution switch control equipment; sales of mechanical and electrical equipment; sales of refrigeration and air conditioning equipment; sales of fire-fighting equipment; sales of sanitary ceramic products; sales of sanitary ware; sales of special equipment; sales of security equipment; sales of digital video surveillance systems; sales of architectural ceramic products. (