**See bottom for update as of 11/20/13
First, let me say I am a master's student in nutrition and do know what I'm talking about. I highly recommend taking zinc for anyone experiencing dry and flaky skin on their face. It can help for oily skin too, but my experience is with dry skin, detailed below.
My biggest lesson is that taking oral contraceptives can cause pretty big vitamin/mineral imbalances. My conclusion after much education is that my hormones were regulated on the pill*, but my vitamin/mineral imbalance has actually been responsible for my breakouts. What I thought were hormonal breakouts were actually deficiencies.
So far I've corrected D3 and B12, but my skin was still dry and flaky on my face, no matter how much I moisturized (seriously!). The dry skin was causing uncoverable breakouts that were frustrating and embarrassing on a daily basis. Since nearly all acne products deal with oily skin, you can imagine my exasperation. I then looked to my minerals, and arrived at the idea that I might have a zinc deficiency, which can cause flakey skin and poor wound healing, and is especially prevalent in vegan/vegetarians. I started adding 30 mg zinc with 1000 mg vit c at bedtime.
Together with the 15 mg in my daily vitamin, my skin has actually begun to heal, has stopped flaking, is responding to my nightly hydrosol + serum (evanhealy rosehip repair serum and immortelle hydrosol). Scars are far less noticeable, and my breakouts have greatly decreased already... and it's only been a week!
Bottom line: add some into your daily/nightly routine, it can't hurt. The daily upper limit for adults is 40mg (which I'm exceeding by 5 for now), so be cautious not to overdo it, since zinc toxicity can deplete your other minerals like copper and iron, which can cause other issues.
I'll update in a few weeks, my goal is to be clear by Thanksgiving!
*Yasmin caused me the life-threatening side effect of hyperkalemia and panic disorder, I strongly recommend switching away from it (or Yaz) if you're taking it. I have made a full recovery since stopping oral contraception within a month.
I upped my intake to 50 mg/day of chelate along with the one 1000mg vit C tab at bedtime (in addition to the 15 in my multi) and have had FABULOUS results. I know I must have been very zinc deficient, as this often happens to vegans (zinc is less bioavailable in plant sources). HOWEVER this dosage is only "safe" for up to a few weeks and MUST be supplemented with iron/copper or you risk depleting those minerals (take a multi!). I'm going to bump it back to 30 mg/day in December, then in January just the 15 in my multi. Mineral imbalances only require loading doses for a short period, don't overdo it!
My skin is nearly completely clear and is no longer dry and flakey. I have only 3 small active spots right now and even those are healing (compared to 15+ daily about a month ago). I have some hyperpigmentation but know it will fade over time with proper care. My confidence has been restored after a really tough 2 year struggle with my skin. I wish I had known I was zinc deficient sooner! I feel like I can look the world in the face again!