Hey, ran into that exact same issue with a mitochondrial peptide last week, figured it was the concentration. Mixed a fresh batch and it was fine, but since I only had a small amount of diluent for a smaller vial and dose it at a lower weekly total, thought I'd try using half my usual diluent amount instead. Stuck it in the fridge, appeared totally normal. Checked back on it three days later and it had gone whitish and semi-solid, almost jelly-like. Cupped it in my palm to warm it a bit, then set it aside for thirty minutes, and after swirling it a couple times it returned to normal. So next time I'll just stick with my regular diluent ratio like before.