Inserting an iron nail into an onion is a traditional practice believed to offer several benefits:

1. Enhancing Iron Absorption in Food

The acidic nature of onions reacts with the iron nail, potentially increasing the iron content in dishes prepared with the onion. This method has been used to help individuals with iron deficiency anemia.

2. Natural Pest Repellent

Placing a nail inside an onion can release sulfuric compounds that act as a natural insect repellent. This technique is sometimes used in gardens to deter pests.

3. Extending Onion Freshness

Some believe that inserting a nail into an onion can slow down sprouting, thereby prolonging its freshness.

Does This Actually Work?

While these practices have been passed down through generations, scientific evidence supporting their effectiveness is limited. For instance, a study indicated that adding garlic and onion to food grains can enhance the bioaccessibility of iron and zinc, suggesting a potential benefit in mineral absorption.

However, the specific impact of inserting an iron nail into an onion remains uncertain. It’s important to approach such traditional methods with caution and consult healthcare professionals for reliable advice on managing iron deficiency.

For a visual demonstration of using onion as a natural pest repellent, you might find the following video helpful: