Leave the solution in as being the existence of it can help with breakage and injury linked with drying off after washing. Its principal fatty acid is lauric acid. It's got a high affinity for hair protein which means it bonds to protein and can easily penetrate inside the hair https://allhealthmarket.com/product/health-and-beauty-2/hair-care/biotin-hair-oils-for-hair-growth-anti-breakage-hair-growth-and-collagen-for-natural-hair-growth-anti-hair-loss/