Magnesium - to help me go to the bath room..

Your diary is closed, but this is often an indication of too much protein to not quite enough fat, or too much insoluble fiber, assuming you're actually constipated (peruse the latest couple of pages of "All Discussions," there are several that matter). While taking magnesium is good for a number of reasons, it's not a good idea to depend on anything for "bathroom help," and you may not even actually need it for that purpose.

Hair,skin and nails - (for the biotin) to help with hair loss I noticed 5 months in

Try eating more. Your profile mentions that you average a 2lb per week loss. This, combined with the hair loss is indicative of not eating enough in general.

I know I need more so I'm trying to find out what to take and why I should take it.

Why do you "know" you need more? Unless you're living on Atkins bars, this way of eating is nutritionally complete. You're actually arguably getting better nutrition than you were in the past, due to the reduced amount of absorption-blocking issues, inflammation, and increased fat intake, among other things. Keep in mind that most of the micronutrient stats are optional on nutrition information, so just because it's not listed, it doesn't mean it's not in the food you're eating.

That said, the common supplements are the electrolytes (namely, sodium and magnesium), Vitamin D, and Vitamin K2. This is because these are the most likely to be deficient, and K2 (which is relatively rare) augments Vitamin D absorption.

I must confess I somehow fell out of the vitamin habit a couple of months ago so right now I don't take anything except apple cider vinegar in the mornings and an electrolyte supplement when I workout. I feel good so I figure it's not hurting me too bad. I do need to start back on my Vitamin D as I was deficient in the past and my K2. I used to take krill oil which couldn't hurt to add back either.

I don't have any unusual hair loss (of course I have always shed badly) or symptoms of electrolytes being out of balance at the moment despite not taking anything.

@ettaterrell I just heard about Vit K2 (not K1) last year.

Vit D does many things I guess but one thing is to move calcium into the body. Vit K2 is thought to tell Vit D where to send the calcium. Vit D will move it to like arteries and heart valves without enough Vit K2 instead of to the teeth and bones at least in theory.

I have seen one mouse study where Vit D and K2 reduced artery blockage in as little as 6 weeks. Google will give you a lot of reading options.

The supplements that I use are more of a "bio-hacking" effort than a "need" based one.

1Tbs MCT for appetite control and ketone boost for ADHD
Ginkgo Biloba leaf extract (a pinch in my coffee) for ADHD
Hydrolyzed Collagen (bovine) 1Tbs in my coffee or water once or twice a day as I think of it. For skin, anti-aging and firming. I think it's working.... Either that or my 6-7 months with only 2 pounds lost was spent on skin maintenance, but I've just realized my belly is looking better. Long way to go though.
Magnesium Carbonate 700-1000mg as needed split into two doses. For the over 300 enzymatic processes the body needs it for.
Ascorbic Acid (Vit C) 8000-10000mg a day split into two or 3 doses. For a ninja like immune system.
Highest dose I can find Krill or fish oil when krill is too expensive for brain benefits (ADHD)

@Sunny_Bunny_ I just purchased some of that collagen and I've drank it in plain water a few times. I mean to take it daily but I'm so very forgetful. I was using for my joints but I would love if my skin looked better!

I bought mine from Amazon. Brand is Bulk Supplements.