So you said that Mag-10 etc were ruled out because you were on the AD, not because they were cost prohibitive. I agree that they should not be used on the AD, but the fact that they are also cost prohibitive is important.
You said that you have gotten good progress on the AD. Are you running it in a calorie defecit or a calorie surplus? It matters. I think that during the fat/protein days, there is really no reason for supplements. You should be getting high saturated fat meat, eggs and dairy with some nuts and fish and low carb veggies. It is much more important to make the AD work right than to worry about supps. Add in 6 egg yolks or beef liver which were always recommended on early versions of AD. No high linoleic acid oil IF your are gaining. If you are in a solid deficit you can actually eat more high la oils because you are going to burn everything you eat every day. Also, if you are in a calorie surplus, you should not eat big carb/protein meals on the two carb/protein days right away. In a calorie surplus on Fat+protein, your muscle cells get loaded with fatty acids for fuel and down regulate burning of glucose. Going from that state to a carb+fat meal right away will spike your blood sugar. People have tested out with bgs over 200 (over 11 mmol/dl) in going from high fat, calorie surplus to high carbs within a 48 hour period. As a result, a glucose tolerance test is not even considered to be valid if someone has not consumed at least 150 grams of carbs a day for the last 2 days. It is a little different if you are in a hard calorie defecit (500+ Kcal deficit per day) because even though your muscles will be burning fat, they will not be “fat loaded” and so there is still room to move carbs into the muscle cells right away on the 2 day carb/fat period.
Also, if you are doing the AD right, you don’t want to spike insulin during your workout because one of the important goals of the AD is to raise growth hormone levels and insulin blocks GH release during a workout. No peri workout carbs on the AD diet or else its not AD. The AD WILL cause a short term loss of muscle after a workout but over the course of days and weeks there will be an overall gain if it works for you and you do it correctly. Also the AD should be based on red meat which is already high in creatine. I suppose adding creatine may be OK but you will already be mildly dehydrated on the AD and the creatine can pull water into the stomach which will leave you dehydrated for training. You needs LOTS of water on the AD already.
Basically, if the AD works, your body is making the anabolic agents. The only thing that might help with training on the AD during the F+P days is to add some lactic acid from naturally brined vegetables. These will not turn off any anabolic hormones-they may actually enhance production.