The formula of Wang Laoji is: water, sugar, grass, egg flower, cloth residue, chrysanthemum, honeysuckle, selfheal and licorice.

"Egg flower" is not an egg, but a flower of Apocynaceae, which is named after its petals are yellow inside and white outside, similar to eggs. The emulsion secreted by Gardenia jasminoides Ellis is toxic, and the toxicity of its flowers is unknown.

The chemical constituents of Glycyrrhiza uralensis Fisch have glucocorticoid-like and estrogen-like effects, which can cause pseudoaldosteronism, hypertension, arrhythmia and allergic reaction.

Fang thinks that the most noteworthy ingredient is Prunella vulgaris. It is said that Prunella vulgaris will wither gradually from summer to the future. Therefore, according to the theory of TCM, it was born as "pure Yang Qi", so it dried up when it met Yin Qi, so it can "replenish Jueyin blood vessels". Shennong's Classic of Materia Medica classifies Prunella vulgaris as "inferior medicine", which is toxic and cannot be taken for a long time, while Compendium of Materia Medica calls it "non-toxic". However, many studies show that Prunella vulgaris can cause adverse reactions.

Wang Laoji, a red can, is a "plant drink" and has obtained a license issued by the health department, which belongs to ordinary food. Long-term drinking will not cause harm to consumers, and there is no need to mark "unsuitable people" on the product packaging. Its products are indeed "preservative-free". The test report pointed out that its products do not contain two preservatives: benzoic acid and sorbic acid. Other test indicators are qualified.