looking for kelp sample

[Ray]

You want a product heavy with auxins.

The problem with the synthetic auxins (such as those in K-L-N and SuperThrive, to name a couple) is that they are very chemically unstable, so your "new" bottle may be chemically inactive once you get it. Improper storage can kill them in no time.

I cannot speak for Maxicrop, but KelpMax actually has a preservative in it to keep it active for a number of years.