Equistress Flash by ESC Laboratoire is a supplement enriched with tryptophan, which soothes stressed and anxious horses. The presence of triptophan associated with plants known for their soothing properties make Equistress Flash a very effective concentrated supplement to soothe the horse in cases of stress: Tryptophan is an essential amino acid for horses, it is a precursor of serotonin and is the source of melatonin, the sleep hormone. Plants with soothing properties in cases of stress or nervousness: hops, St. John's wort, hawthorn, lemon balm, passionflower, etc. What should you combine the Equistress Flash skincare product with? To act in the longer term, you can use the formula enriched with tryptophan: Tryptophan +. If your horse is stressed and has digestive discomfort linked to stress, you can use the mixture of plants and clay: Equistressmix. It is also possible to use bud macerate of Fig Tree (stress and digestive discomfort) or Linden Bud (stress and nervousness) or both in combination.