I'm looking for it, too. After three days, I found a good website, State Food and Drug Administration (official website Data), where data were published. According to these data, I also determined that Huaxing and Wang are two normative brands with much higher technical strength and total flavonoids. As for which brand is better, I think they have their own advantages.

Huaxing brand propolis liquid

The content of effective components/iconic components per 100g contains: total flavonoids 8.0 1g and proanthocyanidins 5.9g

The main raw materials are propolis, grape seed extract and edible alcohol.

There is no chemical cost for this, but the approval date is 2006- 10- 12, and the approval time is earlier.

Product Name Wang's Brand Propolis Soft Capsule

The content of effective components/iconic components per 100g contains: total flavonoids 9.101g.

The main raw materials are propolis, polyethylene glycol 400, gelatin, glycerol, water and ethyl paraben.

The approval date is 20 10-06- 12. The approval time is relatively late, and the flavone content is relatively high, but there is ethyl p-hydroxybenzoate. I generally don't like chemical things. Of course, polyethylene glycol 400 is alcohol, so there is nothing to say.