What is best natural way of reducing cholestrol (ldl) in adults?

Cholesterol: The AHA (American Heart Association) is probably your best resource. In general, lowering dietary fat intake to no more than 30% of calories, while increasing aerobic exercise, will help. Here's a good resource: https://www.heart.org/idc/groups/heart-public/@wcm/@hcm/documents/downloadable/ucm_300460.pdf

Lifestyle can be: very powerful in lowering cholesterol. Most effective are dietary strategies: limited saturated fat (meat/dairy), eliminate trans fats, increase soluble fiber, optimize weight. This will be aided by moderation in sugar, including alcohol, intake. Exercising most days of the weeks will also help. You can accomplish a tremendous amount of cholesterol lowering with these strategies. Good luck!