Short answer: aluminum-free deodorants stop odor but don’t block sweat. Benefits for men include:

• Controls odor without blocking sweat glands — lets your body’s natural cooling and toxin-excretion work as intended.
• Lower risk of skin irritation and redness — many men who react to antiperspirant formulas (itching, burning, bumps) find aluminum-free options gentler.
• Better after shaving — less stinging and fewer post-shave reactions because there’s no astringent aluminum salt.
• Fewer white marks and yellow stains on clothing — aluminum compounds can react with sweat and fabrics; aluminum-free formulas are less likely to cause those marks.
• Less pore clogging — antiperspirants can contribute to plugged pores; aluminum-free options reduce that risk.
• Often formulated with simpler/cleaner ingredient lists — easier to avoid fragrances or ingredients that some men prefer not to use.
• Good option if you prefer “natural” personal care or want fewer synthetic actives near the skin.
• Easier transition for sensitive-skin areas (e.g., thin underarm skin, irritated skin from shaving or bodywork).

Practical notes and trade-offs:

• Aluminum-free deodorants do not prevent sweating. If you need to reduce perspiration (e.g., for sports, formal wear, or heavy sweating), an antiperspirant or clinical-strength option may be more effective.
• You may need to reapply during the day and try a few brands to find one that controls your odor and scent preferences.
• Some aluminum-free products use baking soda, which can irritate sensitive skin; others use plant extracts, probiotics, or zinc-based actives — choose based on your skin tolerance.
• If you have persistent heavy sweating (hyperhidrosis) or recurring skin reactions, consult a dermatologist for targeted treatment.

If you’d like, I can recommend common ingredient types to look for (or avoid) and a few well-reviewed aluminum-free products tailored to men’s skin and activity levels.