You'll never guess what happens when you put jello in your hair! Gourmandize Staff, 06/28/2017 Gourmandize shares Share on Facebook Share on Twitter Pin it Share on WhatsApp Share on Google+ 3/4 Previous Next jello for hair Frequent use hair jello hair treatment: In a 250 ml shampoo bottle, mix 15 g of unflavored gelatin. Shake the bottle for 1 minute before each time you are going to apply this treatment. You can apply it every other day, but pay attention to how your hair reacts as you use it.