Can I use this soap on my hair as a 2-in-1 wash?

Yes, the product is described as suitable for hair when you want a practical 2-in-1 wash for bath, sauna or travel. It is not a dedicated shampoo, so expectations should be adjusted: it gives a light, fresh hair wash without the heavy feel of rich conditioning products. If you have dry or long hair, you may still want a conditioner or a drop of oil on the lengths after washing. To use it on hair, wet your hair thoroughly, work a small amount of the soft soap between your palms, massage it into the scalp and hair, then rinse well. Avoid contact with eyes — if soap gets into them, rinse with plenty of clean water. Because any soap can affect the scalp differently, the source recommends observing how your scalp responds before making it a regular hair wash. If you notice tightness, flaking or irritation, stop using it on hair and stick to body use.