1. Overview of Vitamin A

The Vitamin A, with the synonyms of Chocola A,Hydrovit A,Lutavit A and Retinol, is one kind of Straw yellow crystal powder. As one chemical being stable under recommended storage conditions,Vitamin A should be avoided away from strong oxidizing agentsThe retinol form functions as a storage form of the vitamin, and can be converted to and from its visually active aldehyde form, retinal.

The associated acid (retinoic acid), a metabolite that can be irreversibly synthesized from vitamin A, has only partial vitamin A activity, and does not function in the retina for the visual cycle.

2.Toxicity of Vitamin A

In general, acute toxicity occurs at doses of 25,000 IU/kg of body weight, with chronic toxicity occurring at 4,000 IU/kg of body weight daily for 6–15 months. However, liver toxicities can occur at levels as low as 15,000 IU per day to 1.4 million IU per day, with an average daily toxic dose of 120,000 IU per day, particularly with excessive consumption of alcohol. In people with renal failure, 4000 IU can cause substantial damage. In addition, excessive alcohol intake can increase toxicity. Children can reach toxic levels at 1,500 IU/kg of body weight

3.Vitamin A manufacturers in China

There are many good Vitamin A manufacturers in China, if you want to know more about Vitamin A manufacturers in China, you could search online for some leading Vitamin A manufacturers.Also,we will recommend  some outstanding Vitamin A manufacturers to you.

(1).Vitamin A 90% from Xi'an Rongsheng Biotechnology Co., Ltd. This company is specialized in the study, production and sales of natural plant extracts, which was used in the industry of pharmaceutical, dietary supplement, food and cosmetic

(2).Vitamin A 98% min from  Xi'an Feida Bio-tech Co., Ltd . This company is a high-tech enterprise who specializes in planting, development, production, processing and selling of natural plants and food addatives.And its Vitamin A products details are as below:Light yellow or yellow-brown Assay: 98%.

(3).Vitamin A from Afine Chemicals Limited.This company is specialized in the fine chemicals and pharmaceuticals and we have enjoyed great popularity in world markets.