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Protein powder — what it can and can't do, how much protein is actually useful, and why the "anabolic window" panic is overblown.
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Creatine — one of the best-supported supplements out there, plus the truth about loading, timing, "advanced" forms, and myths like dehydration, cramping, and hair loss.
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Caffeine — a genuinely effective performance aid, why more isn't better, and the single biggest trade-off most people ignore: sleep.
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Beta-alanine — a real but event-specific supplement, what that tingling actually means, and why it's not a muscle builder.
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BCAAs and glutamine — two supplements with great biology but surprisingly weak real-world value once your protein intake is adequate.
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"Testosterone boosters" and "fat burners" — the two most heavily marketed and least supported categories, plus the serious contamination and adulteration risks that come with them.