The Manual

Most fat burner supplements work by pushing your nervous system harder. L-carnitine works by improving how your cells actually burn fat. Here's the difference that matters.

Semaglutide has dominated the weight loss conversation for the past several years. GLP-1 drugs have reshaped prescribing practices and introduced millions of people to medically supported weight management for the first time. But semaglutide is not...

Glutathione supports skin health, liver function, athletic recovery, and cellular aging. Here's who benefits most — and why delivery method determines whether it actually works.

Not all peptides do the same thing. Here are the most studied options for the three goals people ask about most, and how to think about choosing between them.

Sermorelin stimulates your body's own growth hormone. HGH replaces it from outside. For most healthy adults, one of these is significantly safer and more accessible.

Convenience is worth something. But only if the therapy actually works. As sermorelin therapy has grown in popularity, so has the range of available formats. Alongside the subcutaneous injections used in clinical settings for years, oral sermorelin...

Both NAD+ injections and nasal spray bypass digestion — but they serve different needs. Here's how to decide which delivery method fits your life.

NAD+ and NMN both support cellular energy and healthy aging — but they work differently and deliver different results. Here's how to choose.