There isn't a one word answer to that question, and what is considered "natural treatments" might mean different things to different people.
Let me give you a recent encounter I had as an example of this:
I had a potential client, who had a confirmed diagnosis of type II diabetes ask me my opinion on cinnamon as a "treatment" for type II diabetes. If you're not familiar, some research claims that cinnamon has properties that lower blood sugar. There's a few flaws here. The first is, type II diabetes is an insulin issue, not a blood sugar issue. Another issue is, and this is what my exact words to this person was: "Is the CAUSE of your type II diabetes a cinnamon deficiency?" She stared at the ceiling for seemingly 1 minute then replied laughingly, "No".
See what I'm getting at? The problem is that almost nobody looks to the causative factors of illness. We want to focus on treatments, whether they're considered natural or conventional.
I asked my potential client if she would like to find the cause(s) of her problem or simply treat it with medicine or other ways. She wanted to find the cause. That's a great start.
Everybody asks me, "What can I take for my bloating?" "What can I take for my hormones?" "What can I take for my thyroid?" I ask, "Why not remove cause?"
Now, I'm not saying that supplementation, If we're lumping that in with "natural treatments" doesn't work or is unnecessary. That wouldn't be accurate. As a matter of fact, in most cases, those things are necessary, at least in the short term. Severe vitamin and mineral deficiencies are real and dangerous, but we make sure we confirm that through the proper testing. The problem arises when we have a "this for that" mentality and ignore causative factors.
So what should the approach be? Step one is asking the right questions. Before I sit down with anybody, they are required to answer hundreds of questions that initially helps me identify the causative factors. We ask questions that range from, "Were you vaginally delivered?" to "How many amalgam (silver) fillings do you have?
Step two is do the proper testing to identify cause(s). Diagnostic testing is extraordinarily valuable if the proper testing is done.
Step three is possibly recommending follow-up testing and/or confirmatory testing if necessary. These steps allow us to gather data and identify what the real problems are. I frequently have people come to my clinic with dozens of prescribed medications and supplements without having any testing done or have being asked any questions? How does the doctor know how to work with someone without any data?
The moral of the story is that natural treatments and conventional treatments are just that... treatments. Identifying causative factors is more valuable to the doctor and patient to begin a path to healing.