There are two primary sources of 𝐕𝐢𝐭𝐚𝐦𝐢𝐧 𝐀.
𝐏𝐥𝐚𝐧𝐭 𝐬𝐨𝐮𝐫𝐜𝐞, or 𝘱𝘳𝘰𝘷𝘪𝘵𝘢𝘮𝘪𝘯 𝘈:
𝐀𝐧𝐢𝐦𝐚𝐥 𝐬𝐨𝐮𝐫𝐜𝐞, or 𝘱𝘳𝘦𝘧𝘰𝘳𝘮𝘦𝘥 𝘝𝘪𝘵 𝘈:
Examples of low concentrations of Vit A (𝘪𝘯 𝘮𝘪𝘤𝘳𝘰𝘨𝘳𝘢𝘮𝘴 𝘢𝘯𝘥 % 𝘰𝘧 𝘥𝘢𝘪𝘭𝘺 𝘷𝘢𝘭𝘶𝘦).
Though most get their Vit A from plant sources, in reality, its absorption is not great.
To make the matter a bit more complicated, 𝘥𝘦𝘧𝘪𝘤𝘪𝘦𝘯𝘤𝘺 𝘪𝘯 𝘻𝘪𝘯𝘤, 𝘱𝘳𝘰𝘵𝘦𝘪𝘯 𝘢𝘯𝘥 𝘧𝘢𝘵 𝘢𝘣𝘴𝘰𝘳𝘱𝘵𝘪𝘰𝘯 (conditions like abetalipoproteinemia) affect carotenoid absorption.
𝐂𝐚𝐫𝐨𝐭𝐞𝐧𝐨𝐢𝐝𝐬 are 𝘱𝘪𝘨𝘮𝘦𝘯𝘵𝘴 𝘧𝘰𝘶𝘯𝘥 𝘪𝘯 𝘱𝘭𝘢𝘯𝘵𝘴.
You can take supplements if you can't eat any of the above.
As a bit of curiosity, the first description of the use of Vit A was by Egyptians, as they found it would cure "night blindness".