Vitamin C (as ascorbic acid)

Vitamin C is a water-soluble vitamin that is naturally present in certain foods, that may be added to other meals, and that is also available for purchase as a nutritional supplement. Vitamin C can be found in all three of these forms. Because the bodies of humans are unable to generate vitamin C spontaneously, as is the case in the bodies of most other animals, it is very necessary to consume sufficient amounts of vitamin C through one's diet.

Resources: Wang, Yangxi, Bryan Mackenzie, Hiroyasu Tsukaguchi, Stanisława Weremowicz, Cynthia C.

Vitamin D3 (as cholecalciferol)

Vitamin D3 supports healthy bones, muscles and joints. It helps support the immune system. It also promotes normal brain function and promotes mood. It also supports healthy weight loss. It also helps people who have deficiency of vitamin D.

Resources: Martens, P.J., et al., Vitamin D's Effect on Immune Function. Nutrients, 2020. 12(5).

Quercetin Dihydrate (from Sophora japonica)

Powdered Sophora Japonica Extract, also known as Quercetin, is a plant extract. Normal Intestinal health and digestion, cardiovascular health, and immune system support may all be supported by its consumption. It is also possible that it promotes healthy energy levels.

Resources: ulprospector.com

Echinacea purpurea

Echinacea purpurea is a species of flowering plant native to North America that belongs to the family Asteraceae. It is also known as the eastern purple coneflower, hedgehog coneflower, purple coneflower, or simply echinacea.