The advertisement suggest it's just rooting hormones.
Superthrive, which is about 4$ for a year's supply or more is available everywhere and has similar ingredients FYI.
We have added that and I've added various hormones over the years, I've not seen anything I could ever call significant.
I see no reason why this product would be any different other than the ADA label.
There is no evidence I know of that suggest adding hormones to aquatic plants helps in any way in their growth. I've done plenty of searching.
Dr Kane at UF is perhaps the best expert on the topic and is a good plant guy interested in aquatic botany/ornamental aquatic plants and is well connected with Florida Aquatic nurseries in Florida. Brad, the owner's son went to UF to study with Dr Kane.
Heck of a nice guy too, I took a group from one year's plant fest to see the lab, very impressive. I did some of the test he published and had similar results with Crypt flowering.
Fe from any supplement is not going to help red plants become redder, it will help the plants grow better if limiting, there is no Fe in the red pigments in plants nor is a limiting co factor in most of the enzymes along that pathway.
Plants will limit other pathways before they limit that one as it's very critical to new growth and development.
I do not think anyone has ever seen much redder color from manipulation of Fe, I sure haven't. It's tough to say also as it's an arbitrary unit(color, but can be measured accurate with the right equipment) as well as a trace element, so the influences can be rather subtle at times and given that there are general sources, such as ADA AS as other Fe source, very difficult to say.
ECA is very similar to the Dupla Daily dose drops for Fe.
Suspiciously similar........I hope that the chelator is different though.....
A simple test using an acid to unchelate the Fe and then analyze the remained would be able to tell which chelator is used.
Such issues lead to many questions and few answers.
So you might be left with testing such things yourself, rather than any real consensus.
Try and see if there is any different between say super thrive and GG. If not, why not buy the Superthrive for a 10X or more less?
Regards,
Tom Barr