10 Best Hydroponic Nutrients & Additives 2026

Welcome to our Top 10 Product Reviews for Hydroponic Nutrients & Additives in the Indoor Gardening & Hydroponics category. We reviewed and scored many products in this category and found products ranging from a 7 up to an impressive 9.7. Our top-rated product belongs to the industry leader, General Hydroponics. Their 1-Set Paradisiac Popular GH pH Control Acid Alkaline Water Test Kit is a must-have for any serious indoor gardener or hydroponics enthusiast. This 8 oz kit comes with a 1 oz indicator and General Hydroponics' trusted pH control Up and Down solutions, ensuring accurate results every time. But that's not all, General Hydroponics offers a wide range of nutrients and additives for all stages of plant growth, making them the go-to brand for any hydroponic setup. Keep reading to discover our other top picks and take your indoor gardening to the next level.