What is Oxalic Acid? Benefits and Food Sources Explained


What is Oxalic Acid?

Oxalic acid is an organic acid commonly found in plants. Its chemical formula is H2C2O4, and it exists as an oxalate ion. It is a colorless crystal that is highly soluble in water. Oxalic acid is produced during the growth process of plants and is believed to play a role in the transport and storage of calcium within the plant, as well as in the detoxification of harmful substances.

Benefits of Oxalic Acid

Oxalic acid is known to have several health benefits:

  1. Antioxidant properties: Oxalic acid acts as an antioxidant, helping to remove harmful free radicals from the body. Free radicals can contribute to cell aging and the development of cancer, so the antioxidant effects of oxalic acid may help maintain overall health.
  2. Detoxification: Oxalic acid has a detoxifying effect, helping to remove heavy metals from the body. Heavy metal accumulation can have negative health consequences, making the detoxifying properties of oxalic acid important.
  3. Skin health: Oxalic acid promotes skin cell turnover and helps maintain a healthy skin renewal process. This can help prevent the formation of dark spots and dullness, contributing to a clearer, more radiant complexion.

However, it is important to note that excessive intake of oxalic acid can increase the risk of kidney stones, so caution is necessary.

Food Sources of Oxalic Acid

Oxalic acid is found in many plant-based foods. The following foods are known to be particularly high in oxalic acid:

  1. Spinach: Spinach is one of the foods highest in oxalic acid, containing about 600mg per 100g.
  2. Okra: Okra is rich in oxalic acid, which is known for its slimy texture. It contains about 50mg of oxalic acid per 100g.
  3. Rhubarb: Rhubarb is a plant that contains high levels of oxalic acid, which contributes to its tart flavor. It contains about 500mg of oxalic acid per 100g.
  4. Black tea: Black tea contains oxalic acid, with about 10mg per cup (200ml).

Incorporating these foods in moderation can help you obtain the health benefits of oxalic acid.


Oxalic acid is an organic acid commonly found in plants, offering health benefits such as antioxidant properties, detoxification, and promoting skin health. It is found in high amounts in foods like spinach, okra, rhubarb, and black tea. However, excessive intake should be avoided.

While oxalic acid can be beneficial to our health, moderation is key. Incorporating foods containing oxalic acid as part of a balanced diet can help maximize its benefits. However, it is important to listen to your body, as some individuals may have sensitivities to oxalic acid. Finding the right balance and maintaining a healthy relationship with oxalic acid is crucial for overall well-being.