It’s really inefficient to build size while avoiding carbs. Keto diets can work well for fat loss, but to put on muscle, your body needs some carbs to fuel hard lifting and
to optimally recover. A couple of articles talk more about why. This is one of them.
In any case, I’d make Indigo-3G a priority to get insulin sensitivity under control and help your body to better manage whatever carbs you do take in. It’s a great supp to help with body composition. This article talks more about its benefits.
Plazma would be the next choice. It’s workout nutrition that contains fast-acting protein, carbs, and other nutrients for better recovery and harder training. And it has no stimulants. Even if that was the main source of most of your daily carbs, you’d be in a much better place to add some muscle even if it’s not technically keto.
That combo would be a solid one-two punch to get started. Pair it up with the right training and enough total calories, and you should be on track.
Also, approaching 40, you should definitely get some basic hormone bloodwork done at your next check-up, since we naturally lose Testosterone as we age and lower T can put everything on a downswing (health, fat loss, muscle mass, general motivation, etc.). Alpha Male is a high-potency natural Test booster to help avoid any issues on that front.