Depends on what you have to spend - don’t skip out on better groceries to pay for this stuff. It’s about 2-3x the price now compared to what it’s always been, it’s not magic, and it can blow up your toilet bowl for some users.
But it does help strength therefore muscle mass (eventually), it’s been proven to work & be safe, and it’s the first performance supplement I’d recommend after putting a cheap carb powder like dextrose or even Gatorade & a few shakes of table salt in your intraworkout water.