Fast Acting insulins are in clinical use for the treatment of diabetes, BUT these insulins have not reached the same pharmacodynamics as natural insulin from the human pancreas. Fast acting insulins at high concentrations tend to aggregate and this slows down its action after injection. It usually takes about 15 min. for the fastest acting insulin to take effect. But insulin from the marine cone snail works in as little as 5. They capture their prey using 200 different compounds, one of which is a fast acting insulin and in clinical studies using this insulin structure on human insulin receptors and animals is looking very promising!
