I personally think they are all a pain in the butt! See Dropfactorbook.com for my way of counting via the diabetic exchange

Very safe and might even increase sperm count!

The optimal time is when YOU prefer training and as long as you have something in your system, you're good to go and it is all personal preference

Any amount of alcohol will be deleterious, with more being even worse. READ THIS! https://content.tigerfitness.com/does-beer-make-you-fat/

It cannot hurt, but lacks data

1) IF you only get them from free form aminos. If you have adequate protein in your diet, all you need is BCAA intra workout. 

2) It all comes down to caloric balance and I will argue the MPS affect throughout the day overrides any minor caloric intake. BUT, intraworkout is its greatest application.

3) No problem!

Xtend is now Scientifically Proven Two Times More Effective than Whey Protein! The first supplement ever proven to double your fat loss, double your muscle gain and double your strength when compared to whey protein! Has Xtend Made Whey Protein Obsolete? In a groundbreaking, double blind independent study led by Jim Stoppani, PhD, Scivation Xtend was scientifically proven to be 2 times more effective than Whey Protein. The Xtend subjects experienced 9lbs of lean muscle growth in 8 weeks. That is 2 times more than the whey protein group. The Xtend subjects lost 2 times more fat than the whey protein group. The Xtend subjects more than doubled their strength gains over the whey protein group. Imagine naturally gaining 9lbs of lean mass, losing 4 pounds of bodyfat and experiencing a massive increase in strength gains in just 8 weeks! All of these groups were on the EXACT SAME diet and training programs provided by Jim Stoppani, PhD along with Chuck Rudolph, MEd, RD and Team Scivation (www.TeamScivation.com). There you have it. Xtend is scientifically proven in a controlled study to be better than whey for lean mass growth and to lead to significant LEAN MASS GAINS and FAT LOSS! No other supplement can claim this! The bottom line is that if you can afford only one supplement, Xtend is the only supplement you need. Xtend has made whey and every other supplement obsolete. The groups and the results: Quoted from Jim Stoppani, PhD "The Xtend guys dropped their body fat % by 2%, gained 9 pounds of lean body weight (I call that muscle!), increased their bench press by about 15 pounds and squat by 25 pounds! The Whey group dropped their percent body fat by 1%, gained 5 pounds of lean body weight, increased their bench press by about 5 pounds (7 pounds) and squat by about 10 pounds (11 pounds). The Gatorade group dropped their percent body fat by less than 1%, gained 3 pounds of lean body weight, increased their bench press by almost 5 pounds (4 pounds) and squat by almost 10 pounds (8 pounds) I round up the bench press and squat weight because you can't increase bar weight in reality by anything other than 5 pound increments." "The Xtend group lost an average of 4 pounds of body fat. The whey group lost and average of 2 pounds of body fat. Gatorade group lost 1 pound of body fat." When Will it be Presented and published? Dr. Stoppani is going to present the study at this year's NSCA (National Strength and Conditioning Association) meeting in July. Then it will be submitted for publishing through various journals. Training Training periodization was: Week 0: Baseline testing Weeks 1-2: 4-5 reps Weeks 3-4: 6-7 reps Weeks 5-6: 8-9 reps Weeks 7-8: 10-11 reps Week 9: Final testing The Diet Designed by Chuck and Team Scivation at a 35/35/30 P/C/F ratio. All diets for each group were controlled and exactly the same. this was a hypercaloric diet. Per Chuck: When I was doing the macro calculations, I used the Harris Benedict Equation with an activity factor related to the training program that was designed to GAIN LEAN BODY MASS, there fore these subjects were all in a HYPERcaloric state. Protein grams were figured out first with them being 2.2-2.4g/kg body weight. Due to the load and repetitions of the training program and the fact that the study was based on 10 reps (week 0) then 10 reps (Week 9), not a 1 rep max test, the typical macro ratio for each subject to gain LBM and prevent/lose bf was 30% Carb, 35% Protein and 35% Fat. The goal of the nutrition plan was to priovide calories for Lean Body Mass Gain yet BALANCE INSULIN levels with each meal. Theory being, if you balance insulin you significantly reduce any chances of storing body fat, better yet lose BF. Each subject had the option to chose from the following protein, carbohydrate and fat sources that were already weighed properly for them. They simply had to physically weigh foods and eat: Proteins: Egg white, NF cottage cheese, grilled boneless.skinless chicken breast, 96% Fat free LEAN sirloin/ground turkey, tuna canned in water, fresh halibut/tilapia. Carbohydrates: Oatmeal (plain), brown rice, sweet potato/yam, whole grain pasta and whole grain bread, broccoli, asparagus, Lettuce/tomato/Cucumber, green beans, spinach, blackberries, blueberries, strawberries and bananas Fats: Almonds, peanut butter, avocado, light salad dressing, Olive oil, walnuts The Groups 12 per group=36 total - males 18 - 32 years old - minimum of 2 years consistent training - currently not taking any supplements other than regular vitamin/minerals and regular protein shake - Average age ended up being 26 years old. The Parameters Groups were: 1) 4 Scoops Xtend = 14 g BCAAs (During Training) 2) 28 grams Whey (During Training) 3) 28 grams Carbs as Gatorade (During Training) = Equal calories as the whey protein There you have it. Xtend is the supplement that you NEED during training!

It is probably due to TOO MANY SEATED MOVEMENTS! Focus on closed chain like squats and deadlifts. Read this: https://content.tigerfitness.com/knee-low-back-pain-exercises/

4 days is usually a sweet spot! Read this: https://content.tigerfitness.com/dorian-yates-training-frequency/

30-50g is fine. I do not believe too much will effect Test

That is one option, but sooner or later you will have to decrease calories.

See Dropfactorbook.com