UVA TANNING BOOTHS
They're not a safe alternative. They emit concentrated ultraviolet radiation. In terms of skin, it's a real pain.
MAKEUP EFFECT PRODUCTS
Some drops or sprays will stain your skin like body paint. The color appears instantly, but it can transfer to clothing and not look even if you're not experienced. It's your choice whether you trust an expert or do it yourself.
SELF-TANNERS FOR MEN (THE HEALTHIEST OPTION)
Here, the color doesn't come from the sun, but from a controlled, superficial chemical reaction. A good self-tanner for men, when applied correctly, provides a gradual tan without activating melanin (that is, without causing cell damage). The key, as with any good recipe, lies in the ingredients.