It's a fair question. Human Design isn't a science in the strict sense: there are no studies showing that planetary positions at birth determine how your energy works. That doesn't mean it can't be useful; it means it's best used with judgment.
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The most common criticisms
It lacks scientific evidence, its origin comes from a personal mystical experience, and some descriptions are general enough that many people recognize themselves in them (the Barnum effect). Taking these criticisms seriously is part of using it well.
How to use it with good judgment
The system itself proposes to be experimented with, not believed: try your strategy and authority and keep what works for you. Don't use it to label people, make medical decisions or replace professional help.
Frequently asked questions
Is Human Design a science?+
No. It's a self-knowledge system without scientific validation. Many people find it useful as a practical experiment.
So is it useful for anything?+
For many people, yes: as an invitation to observe themselves, decide from the body and respect their energy. The best way to know is to try it with judgment.