here's alot of good info about a couple nutrient lines, as well as Superthrive:
http://www.420magazine.com/forums/indoor-soil-cultivation/114640-top-nutrient-study-best-produces-most.html
from the link: "Superthrive :
Superthrive a solution highly praised from the manufacturer - as expected. They claim healthier, stronger and generally larger growth. It contains vitamin B-1 (thiamine) and synthetically produced hormones. Thiamine is a beneficial product, specifically when used by animals. It assist in metabolism and many complex functions associated with energy production. It is also produced by plants, fungus and bacteria. When researching this ingredient I discovered it's known benefits are some what unproven in relationship to cannabis. Under organic conditions, with rich microbial life, it seems some what impractical as thiamin is an already available item.
The synthetically derived hormones are Auxins. The primary synthetically derived auxins are 1-Naphthalene-acetic acid and 2,4-Dichlorophenoxy-acetic acid. Both are included here. The first is mostly effective in cloning plants and is also used in plant culture. The second is a plant growth regulator. Auxins are generally all associated with growth and are frequently applied in growth promoting solutions. If over applied they can have an ill effect and lower pH. I used this solution on 2 plants in each cycle at transplant only. I've had varied results in the past with Superthrive and was never confident with how effective it was. The results were noticeable but mild in my opinion. I noticed good root growth and healthy plants when using the product but no major improvement. Production was not improved and I don't use the product frequently. I should mention that it is also renown in improving plants put through stress. There is a distinct possibility that thiamine may get depleted as plants deal with health issues. Naturally, Superthrive could assist in that situation. In high alkaline soils specifically, I've heard it can assist quite a bit in vigorous growth. It's also highly recommended as a cloning additive. I have yet to try it in these applications. "