DHT is necessary for new facial hair development. Unfortunately, DHT blockers are found in so many products you may use on your face, or theoretical "beard area." Here are some common ingredients to look out for in products you use on your face or beard. These could be negatively impacting your beard or body hair progression overtime. 

If these ingredients are used in a high ratio, or as a main ingredient in a product then it is generally unsafe for androgenic hair development. In turn, if used in a very small ratio, then it is generally okay for androgenic hair.

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These DHT blocking ingredients may be great for head-hair, but head hair is different when it comes to DHT. DHT isn't great for head hair (if your genetics predispose you to androgenic alopecia, do men in your family bald?) but again, DHT is also used to create thickened hairs on your facial and body regions (besides your head.) Therefore, blocking DHT on your face in areas where a beard could theoretically grow, is not beneficial or can stunt facial hair growth if used regularly overtime. 

If you already have a full beard, DHT blockers WON'T reverse it or make it fall out, so you're good. But if you're a fresh face, or have a patchy, uneven or incomplete/immature beard, then using DHT blockers regularly can further stunt its development. 

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Remember that not all DHT blockers are created equally, some are more powerful than others.

Here is a list of some common DHT blockers and inhibitors, in no particular order of strength.