I could not find any specific information about a product called "River Nail Spa" in the search results. However, I found some information related to nail care products and services that may be helpful:
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ZOYA Nail Polish: This is a nail polish product available on Amazon.com that comes in a shade called "River." The ingredients listed on the product page include: Butyl Acetate, Ethyl Acetate, Nitrocellulose, Acetyl Tributyl Citrate, Isopropyl Alcohol, Sterikonium Hectroite, Acrylates Copolymer, Styrene/.
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Dear Sundays: This is a nail salon in NYC that offers non-toxic and vegan nail care products. They offer a top & base coat set that is essential for long-lasting nails, as well as a non-acetone 2-in-1 soy polish remover that gently removes polish while nourishing nails with Vitamins A, C & E and grapefruit essential oils.
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Sage Springs Spa: This is a spa at Sunriver Resort that offers manicures and pedicures using hand-crafted products formulated with organic, non-toxic nail polish that is free of formaldehyde and toxic preservatives and chemicals.
Overall, it seems that there are many nail care products and services available that prioritize natural and non-toxic ingredients. However, without more specific information about "River Nail Spa," I cannot provide more detailed information about any products or services they may offer.