As I mentioned in a post when the product launched, there are no potentially harmful prostaglandins (the glaucoma drug in the original Jan Marini Age Intervention eyelash enhancer). In Marini Lash, the main ingredients are moisturizers, sodium hyaluronate and hydrolized glycosaminoglycans.
Next up are three preservatives (two parabens and diazolidynyl urea, which can be an irritant depending on the concentration and the newest formulations are said to be more benign). There are a couple of synthetic peptides, pentapeptide-17, some fatty acids, and vitamin E. Biotin could be promising with its combination of vits H and B7 that are associated with hair growth, although I've seen counterclaims that biotin is not easily absorbed topically. There is also vitamin B12.
Plant extracts include white tea (an anti-oxidant) and horse chestnut (there are claims that this helps stimulate hair growth) and cinnamon (honey and cinnamon is a common hair loss remedy). There is also saccharomyces/copper ferment (this is a posh name for the yeast used in fermentation); I couldn't find anything much about its role in skin or hair care. Neither can I work out what the role of sodium phosphate dibasic is.
I should also add that I had no adverse reactions to using Marini Lash and so pronounce it safe and effective.
Full list of ingredients in Marini Lash:
Water, sodium hyaluronate, hydrolized glycosaminogylcans, diazolidinyl urea, methyparaben, propylparaben, C12-C15 alkyl benzoate, panthenol, acrylates/ C10-C30 alkyl acrylate crosspolymer, myristoyl pentapeptide-17, myristoyl tetrapeptide-12, linoleic acid, linolenic acid, tocopherol, biotin, camellia sinensis (white tea) leaf extract, aesculus hippocastanum (horse chestnut) seed extract, cinnamomum zeylanicum (cinnamon bark extract), butylene glycol, saccharomyces/copper ferment, sodium phosphate dibasic, sodium chloride, triethanolamine, vitamin B-12, folic acid.