AND ENOUGH FOR THE WHOLE WORLD? Normally the leaves are used.

https://www.sciencedaily.com/releases/2022/02/220228114351.htm

“The next step in our research is to identify the specific components in Neem bark extract that are antiviral………stop this non-sense and use it as it shows up in nature!!

Very interesting is also the information below {ivermectin is also effective for scabies!!]

Topical use as a poultice with neem leaves in 814 patients resulted in a 97% cure rate in patients with scabies (Mills & Bone, 2000).

Kuhn, Merrily A.. Winston & Kuhn’s Herbal Therapy and Supplements: A Scientific and Traditional Approach (p. 448). Lippincot (Wolters Kluwer Health). Kindle Edition.

At the moment all neem tree bark at Amazon is sold out!!