Specialized Products
Shaving gels or foams are formulated to protect the skin and facilitate shaving. They reduce risks and provide superior comfort.Temporary Alternative
If you run out of shaving foam, a mild soap or moisturizer can be used in a pinch. Shampoo remains the least suitable product for shaving.Practical Conclusion
Shampoo is useful for cleaning hair and beard, but it should not replace shaving gel or foam. While the practice of using shampoo as a one-size-fits-all solution is common, it is not recommended for maintaining healthy skin.
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From @sawsenbenkhadhr