Please choose the correct ending to complete the given sentence: Health: [header] How to use herbal supplements safely [title] Understand that " natural " doesn't necessarily mean safe. [step] It's important to know that just because an herbal supplement is labeled " natural " does not mean it is safe or without any harmful effects. For example, the herbs kava and comfrey have been linked to serious liver damage.

Ending1: [title] Understand that some supplements should only be taken by people who are not certain of the contents of the supplement. [step] Unnatural herbs may be detrimental to the liver and liver. Ending2: [title] Be aware that herbal supplements are drugs. [step] This means that they can cause medical problems if not used correctly or if taken in large amounts. Ending3: It's important to understand this before consuming them if at all possible. [title] Find a reputable, company-friendly supplement store. Ending4: [substeps] When purchasing a supplement, look for one that includes proper herbal ingredients. Scientific studies have linked this supplement to blood transfusions, shock treatments and organ transplants.

Answer format: ending1/ending2/ending3/ending4