Here are a few things to research for treating acne internally/holistically:
Zinc can help the skin and body heal. It’s good to find a zinc with copper because over time, zinc can deplete copper. You can research this or ask a nutritionist/naturopath for clarification. Optizinc is a recommended brand of zinc for use in treating acne.
Pantothenic acid has helped many people get clearer skin. A little bit of research on that is recommended as well (and again, you can talk to a professional who is licensed to dispense nutritional information/prescriptions). Pantothenic acid can be found at your local health food store or online. A general B complex may be helpful as well as B vitamins are indicated for stress in general, and stress creates cortisol which can trigger acne break outs.
Fish oils are good for inflammatory acne (the kind with lots of redness, heat and blemishes). A good quality fish oil is recommended. These can be a little pricey, but you can experiment with different brands to see how they work for you.
Probiotics can also be helpful. Here is a link to a worthy article on probiotics and acne: https://vitagene.com/blog/probiotics-for-acne/
To find a good probiotic for acne, you can talk to a nutritional specialist or do your own research. I always hit the Amazon and look for the highest rated products and then read the reviews. You have to watch for fake reviews (like when there are 20 on the same day).
Other things to research pertaining to acne are milk thistle for liver support (and more to come…)