Since the DR Govt insists on using pdf files to publish the law on their websites, it is incredibly difficult and time consuming to search for relevant info. The last time I did was for a similar thread on this topic awhile back. At that time, I could not locate a specific law dealing with CBD oil and similar augmented products. It's possible I missed it if there is one.
In the absence of something stating this product is "legal" the determination may rest with the interpretation of the law(s) pertaining to Cannabis and derivative products made from Cannabis. I'm not sure the Govt here has gotten around to making a distinction between products that contain THC above a specific level and products below that level. If there is an administrative policy pertaining to CBD, I'll never be able to find it scouring the website for Aduanas.
As always, one must remember this Country is often decades behind more progressive countries in many aspects pertaining to the law and societal doctrine in general. The law here is a patchwork of conflicting edicts that are extremely difficult to interpret if one is not a native Spanish speaker. Consistent enforcement in this country is like the wind - one day it may be nonexistent and the next howling at gale force. If a legal opinion is needed, best to ask three lawyers and average what they say. If this country has a legal preoccupation, it's drugs and guns. Finding yourself in the crosshairs of an agency such as DNCD or Aduanas even if such attention is unfounded will most likely not be a pleasant experience.
Based on legitimate legal advice, you will need to determine if the the benefits of these products outweigh any potential risks of possessing and using them in the DR. Also the last time I checked, exporting these products outside of the US was not permitted. Not sure if by US Govt prohibition or a self imposed retailer shipping policy. If the former, then possibly possessing these products while travelling to the DR (or any country) might run you afoul of US Customs even if the product was legally purchased and will most likely be allowed entry here by design or apathy.
Not a subject with a clearly presentable answer.