“But some things like Stevia are still next to impossible to get from other sources (the Japanese buy up all the South American stevia)”
Check out the vitamins and supplements at Amazon. Most are made in China. This sector is enormous.
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Grok
Roughly 70-90%+ of key vitamin ingredients (and thus a very large share of supplements) originate from or heavily depend on China, though exact “made in China” percentages for finished products on Amazon vary.
repcoworld.com
Key Distinctions: Ingredients vs. Finished ProductsIngredients/raw materials: China dominates global production. Over 90% of global Vitamin C (ascorbic acid) comes from China. Similar dominance exists for many B vitamins, precursors, and other common supplement components (e.g., high shares for biotin, amino acids, etc.).
repcoworld.com
US imports: Nearly 78-80% of US vitamin imports come from China. Older estimates put Chinese-sourced ingredients in US dietary supplements at 60-80% or higher.
afia.org
Finished supplements: Many are encapsulated, bottled, or “manufactured” in the US (or elsewhere) using Chinese-sourced active ingredients. Labels often say “Made in USA” even if raw materials are imported. Full end-to-end production in China is common for many lower-cost/private-label products sold on Amazon.
consumerlab.com