The efficacy is not great.

Malt extract low sweetness, good solubility, not easy to absorb moisture, good stability, difficult to deteriorate characteristics. This product has the characteristics of strong thickening, good carrier, small fermentation, good filling effect, no moisture absorption, no odor, easy to digest, low heat, low sweetness and so on. Malt extract contains a large number of polysaccharides, in addition to calcium, iron and other trace elements and minerals beneficial to the human body, and can promote the normal metabolism of human substances.

And the penetration of nutrients in the skin absorption law is:

1, with oily and water-soluble substances are the most easily absorbed

2, fat-soluble substances second

3, water-soluble nutrients are the most difficult to absorb

We use two kinds of skin care products, fat-soluble and water-soluble. Human skin contains oil, so compared to the fat-soluble skin care products are absorbed by the skin faster and easier to reach the deeper layers of the skin.

Applied nutrients can't be absorbed and will only accumulate on the surface of the skin, causing oxidation and accelerating the skin's aging process. These nutrients piled up on the epidermis may also become a breeding ground for bacteria, leading to skin irritation. So using malt extract as a mask is not really effective because it is difficult to absorb.

Extended Information

Malt extract is a product of starch hydrolysis with a DE value of less than 20. It is intermediate between starch and amylose, and is an inexpensive, creamy, flavorless, nutritious polysaccharide. Malt extract is generally a mixture of multiple DE values. It can be a white powder or a concentrated liquid.

And in fact, most of the nutrients in human skin rely on the blood in the dermis to provide nutrients, because the capillaries in the dermis contain amino acids, sugars, and other nutrients, and the walls of the capillaries are very thin, with a certain degree of permeability, and the nutrients penetrate from the blood into the dermis.

But macromolecules like sugars can't actually be absorbed by the skin, but instead create an environment suitable for bacterial growth after application, which is highly damaging to the skin.

The composition of malt extract is closely related to its hydrolysis process, the type of starch, and the presence of other components in the starch (e.g., proteins, fats, etc.). Malt extracts with different DE values have different functions and properties: e.g., thickening, gelling, reducing product sweetness, changing system freezing point, inhibiting ice crystal growth, replacing fat, reducing heat, improving texture, and being used as a spraying agent or drying carrier.

It is widely used in the food industry, but the effect of using it as a mask is very little.

Reference:

Baidu Encyclopedia - Malt Extract

People's Daily Online- -Oily skincare products for the most complete absorption