No, your skin cannot absorb gluten from skincare or hair care products. It seems that our bodies can contain gluten only if we ingest it. It's too big to go through the skin. Still, if your skin has lesions or cuts, then applying gluten-based products on it might allow this compound to become absorbed by your body. However, you should avoid gluten-based products if you suffer from Celiac disease because it's best to avoid all risks and, after all, prevention is key.