Nearing 50. What is the best supplement for muscle mass?

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keep doing curls and it seems like my arms keep shrinking.

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Weighted dips and pullups.

protein, creatine, and TRT.

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Not looking to get shredded, but the keep doing curls and it seems like my arms keep shrinking.

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Getting more protein and lifting heavier/harder will likely help, as the others have suggested, but also be aware that about 25-40% of men over 45 have low testosterone levels. You lose about 1-2% per year after 40. Might be good to have that checked if you haven't already.

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Not looking to get shredded,

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Don't worry, you won't. It takes a lot of work for that.

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but the keep doing curls and it seems like my arms keep shrinking.

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I think isolation exercises are a waste of time for most people, especially if you are using a machine. Your pull/back day doing pull ups and rows should hit the biceps enough.

If you successfully tear the muscle fibers in your arms, hit daily protein and calorie goals, your arms will grow because science

What exactly are you trying to accomplish? A low dose of TRT can work wonders if you’re hitting the gym 3-5 times a week

Bob's Red Mill almond powder is good. No seed oil, no artificial sweetener, no soy.

Also want to do fewer reps/more weight. Otherwise you're building endurance instead of strength.

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Not if he’s trying to build mass

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As opposed to low weight/high reps I've found it to work better.

It’s amazing that the Internet still doesn’t get that 2/3 of the muscle in your arm is the triceps.

Squat, deadlift and bench, do some pull-ups.