A study from 2019 used 200mg of Suntheanine for four weeks and reported no significant adverse effects.8 And a review from 2007 considered four well-designed safety studies, all of which point toward a high degree of safety and purity in Suntheanine.9 Numerous companies offer Suntheanine as a supplement, but Swanson has the best combination of manufacturing standards, third-party testing, and a money-back guarantee
However, these important nutrients can be found in a large variety of food sources, including fish (mackerel, cod, and salmon are among the richest), walnuts, chia seeds, flax seeds, hemp seeds, and avocado
[1] HTMLA activity is found primarily in the liver
Emerging evidence suggests oestrogens modulate collagen synthesis, tendon elasticity, healing capacity and load adaptation
Nothing special is required, though arriving well hydrated and having eaten something beforehand makes for a more comfortable visit