Using Reservoir-Tech in Hair and Scalp Tonic

Regarding the use of Reservoir-Tech in a hair and scalp tonic, it is generally not recommended for application directly onto the hair strands. This is because Reservoir-Tech works by forming a thin film to retain and gradually release active ingredients, which can lead to a sticky feeling and potential flaking on the hair.

However, it can be used effectively for targeted application on the scalp, particularly in formulations aimed at treating specific areas like hair loss. When applied directly to the scalp and massaged in, it allows the active ingredients to be absorbed into the skin over time without causing issues on the hair itself.

Reservoir-Tech is suitable for use with water-soluble active ingredients. It functions as a film-former to help active substances stay under the skin longer, allowing for gradual absorption. This can help reduce potential irritation from highly concentrated actives and provide a longer-lasting effect.

A key limitation mentioned is the requirement to perform a patch test for at least 28 days when using Reservoir-Tech with any ingredient to verify its effect before broader application or sale.