The Kick is a GH (growth hormone) booster, whereas the Stak is a testo booster. Testo boosters (as with real test versus GH) are likely more effective for most people, although GH can help with joints and getting lean.

These are very different products. The V-max gives you energy and a pump as a pre-workout product. GH Kick is designed to increase growth hormone levels as a pre-bed supplement.

No, HGH is a controlled drug that can only be prescribed by a doctor.

If you have a fast metabolism or want to gain weight/muscle as fast as possible, go with a weight gainer product like Mutant Mass or Mass-Tech, etc. With Mutant, you need to take the creatine with it (Mass-Tech includes it). You can also use a protein supplement alongside but you can't gain unless you get more calories than you burn and for that you probably need a weight gainer or a lot more food.

Could you repeat the question, I'm not quite clear on your goals'

Here is the Nutritional Information, including servings, as appears for each product on the website:
Container Size: 450g
Serving Size: 2 scoops (30g)
Servings Per Container: 15

Amount Per Serving:

Total Calories: 114
Protein: 5.4g
Total Carbohydrates: 23.20g
Fat: trace

Amount per serving:

L-Glutamine: 2g
Lysine hydrochloride: 1.2g
Arginine pyroglutamate: 1.2g
Nicotinic acid: 75mg

Other Ingredients:

Dextrose, Glutalysinopyro (a patent blend of L-glutamine, lysine hydrochloride, and arginine pyroglutamate), orange flavouring, citric acid, malic acid, colours, beta-carotene, nicotinic acid, zinc gluconate, potassium gluconate, vitamin A, sweeteners, sucralose

This is a Growth Hormone boosting product. It doesn't boost testosterone. Growth hormone isn't as powerful as testosterone but it is thought to make you leaner.

See the article - http://www.tropicanafitness.com/view/v/article/a/53 - for the best info on testo-boosters.