1.Sometimes the company's website will have a supply chain statement on it, especially if laws require it (such as in California and the UK). Useful links on a company website include "about" and "investor information" or areas about corporate responsibility or social impact.
ProTip: Did you know you can use Google to search a website? Try this and see more tips under How do I...Google Better.

2. Is your company a subsidiary? For example, CeraVe is a subsidiary of L'oreal so you'd also want to look on the L'oreal site.
3. Look at the ingredients. They may be where forced labor happens, rather than at the product level. For example, mica is an ingredient of a lot of makeup so you'll want to Google that ingredient.
4. Don't just look on the company website. See what else you can find about the company's practices on the web. Look for news stories and reports from non-profits.
5. Be sure to evaluate the information before you use it.