glutathione and type 2 diabetes IV Mellitus Glutathione for Type 2 Diabetes:

However, there are newer options available that may be used, depending on the expert center you are referred to (e.g

The 90-degree angle (straight in) is appropriate when adequate tissue depth is present and no pinch is needed

(Source 4) Liposomal Supplements for Gut Health Supplementing with vitamin C and glutathione supports a healthy gut microbiome

Katoh et al., 1993

Latex-free Smooth needles Lubricant: BD needles are coated with a low-friction lubricant to create a smoother edge that makes injecting easier and less painful

Of course, this is valid after the recommended daily dose is established, here it is referring to animals