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As a critical component of numerous body parts, from muscle and tendons to skin, supplementation has the potential to improve strength, functionality, and appearance.19 You may need to take up to 15g/day, however, which is one reason this ingredient is often sold on its own, rather than mixed in with other recovery aids.52 Protein powders and mass gainers or meal replacements If you want to build muscle, you have to get enough protein, but balancing out your other macronutrients (fats and carbs) is also critical
It is not FDA approved in the US
Using them in combination may provide complementary benefits: NAD+ primarily supports cellular energy production, DNA repair, and metabolism, while NAC boosts antioxidant defenses, supports liver health, and helps with detoxification
Rarely, some people may have allergic reactions, such as itchy skin, eye irritation, throat discomfort, or swelling
One study used 300 milligrams a day for four months with good tolerance
