Organic Cotton:

Organic cotton is a renewable, biodegradable material that can be used for the absorbent core of the tampon. It’s free from pesticides and synthetic chemicals which can be better for both the environment and the user’s health.

Bamboo Fiber:

Bamboo is a fast-growing, renewable resource that can be processed into a soft and absorbent fiber. It’s naturally antibacterial and biodegradable.

Hemp Fiber:

Hemp is another sustainable, absorbent material that could be used in a tampon. It requires fewer pesticides and less water to grow compared to conventional cotton.

Silk:

Although not vegan, silk is a natural, biodegradable material that could potentially be used in some parts of a tampon, given its smooth texture which could aid in insertion.

Biodegradable Plastics:

For the applicator, biodegradable plastics made from plant-based polymers such as PLA (Polylactic Acid) could be used. These plastics break down faster than conventional plastics when composted properly.

Cardboard:

Cardboard is another option for the applicator. It’s biodegradable and can be made from recycled materials.

Biodegradable Films:

Some biodegradable films made from plant-based materials can be used for the wrappers or packaging.

Natural Dyes:

If coloring is desired, natural dyes can be used that are free from harmful chemicals.

Wax Coating:

For features like leak-guard, natural wax coatings can be explored that are biodegradable.

When designing a biodegradable tampon, it’s essential to ensure that all materials, coatings, and dyes are safe for internal use, and it would be beneficial to have the product certified by relevant health and environmental organizations.