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Nick rooting hormone products are commonly IBA (Indole 3-butyric acid) in a number of configurations. The common one here is Roots powder with three strengths, 1, 2 and 3. They are 1%, 4% and 8% respectively. The higher %, the harder wood plants they are designed for.

.3 or .8% IBA would likely be the Rx Nick. If you can get a vitamin B-1 product that might help too.