"Becoz ur product cannot be shipped to other countries "
If the cooking/boiling of the cannabis or hemp is done correctly, the oil should mix well with the shampoo.
However, I would not recommend using cannabis for hair growth. Several studies directly link heavy cannabis use to hair loss. Although, most of those studies specify THC as the likely culprit—which is why I recommend hemp over cannabis (0.3% THC or less).
There is, however, a plethora of anecdotal evidence suggesting that CBD may improve the health of hair follicles—and also reasonable inferences as to why that may be: CBD is high in Omegas 3, 6, and 9 fatty acids, which promote scalp and follicular health; hemp is high in vitamin E, which helps hair retain moisture and also prevents cell death via oxidative stress (is an antioxidant); is high in the essential fatty acid linolenic acid, which can lengthen the growth phase of hair follicles; and CBD, itself, is a powerful antioxidant.
Here is a great recipe shared by the co-founder of HelloMD, Pamela Hadfield, that should also be great for your hair. I recommend that you also use the oil as a hair treatment on its own.
I hope this helps!