B-52 is a liquid plant tonic from Advanced Nutrients built around vitamin B-1, a B-vitamin complex, kelp and humic acid, with a light 2-1-4 NPK plus magnesium, calcium and iron. It is sold as an anti-stress supplement for indoor and outdoor plants and works in coco and most hydroponic media. The best new price is $26.11 at HTG Supply as of November 6, 2026, with two stores listing it new.
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Lowest price we've seen: $23.99 on Nov 7 at Hydro Pros. Tracked across 3 stores since Nov 7.
Rated 4.9 out of 5 from 373 ratings, buyers mostly report healthier-looking plants after transplanting and during stress periods. Complaints center on cost per liter and the need to keep buying it alongside a base nutrient line.
