I'm not at all certain about anyone else, but I'd like to know what Epin and Cirkon are? A search of the botanical/horticultural literature showed no citations for either substance. Do You have the chemical name of either of these?

Epin appears in adverts at the top of a Google search.

Unless the OP can give more I would say ignore the query.

I used Epin on my tropical fruit trees as well as other plants in my garden and was pleased with the result. However, I just learned there were other growth hormones products that will work just as well or better than Epin. I will try them and will post the result.

"Unless the OP can give more I would say ignore the query."

WOW! Now that's what I call friendly advise. Albert must have been in an especially cordial mood when he wrote that.

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Epin is a fairly well-known trade name for synthetically prepared epibrassinolide, a natural plant growth hormone. It reportedly acts in multiple ways to increase plant vitality and growth.

Cirkon is a trade name for synthetically prepared Hydroxycinnamic acid. It reportedly acts as a plant immunomodulator, root developer, and bloom booster.

Some sources recommend using these two products together for even better results. Sorry, but I haven't tried either.