Here is my stack at the moment:

20mg Odourless Garlic extract (equiv. to 2g of garlic clove)
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120mg of standardised Ginkgo Biloba (equiv. to 6000mg whole leaves)
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2 'Eye-Q' capsules altogether containing:
800mg fish oils (186mg EPA, 58mg DHA)
200mg Evening Primrose Oil (20mg GLA, 3.8mg vitamin E)
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1000mg Flaxseed Oil
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9 Ortho-Core capsules altogether containing:

Phytonutrient Complex
Calcium D-Glucarate ………………………………….. 15 mg *
Chlorophyllin Complex………………………………… 300 mg *
Trans-resveratrol (Chirally Pure)………………………. 1.8 mg *
Indole-3-Carbinol (I3C)………………………………… 20 mg *
Sulforaphane ………………………………………….. 7.1 mg *

Vitamins
Vitamin A Complex
Retinol (palmitate)……………………………….. 150 mcg 500 IU 16.70%
Natural-Source Mixed Carotenoids:
Alpha-carotene……………………………… 1.6 mg 1332 IU 44.4%
Beta-carotene………………………………. 6.0 mg 9990 IU 333%
Cryptoxanthin………………………………. 30 mcg 25 IU 0.8%
Lutein………………………………………… 6.7 mg *
Lycopene……………………………………. 18 mg *
Zeaxathin……………………………………. 545 mcg *

Vitamin B Complex
B1 (Thiamine) …………………………………... 9 mg 750%
B2 (Riboflavin) ………………………………….. 2.5 mg 192%
B3 (Niacin (as 144 mg Inositol Hexanicotinate))… 115 mg 718%
B5 (d-Ca Pantothenate)………………………….. 100 mg 2000%
B6 (Pyridoxine)…………………………………… 25 mg 1470%
B12 (Cyanocobalamin)…………………………… 24 mcg 1000%
Folic Acid…………………………………………. 800 mcg 400%
Biotin……………………………………………… 300 mcg 1000%
Pyrroloquinoline quinone (PQQ)………………… 30 mcg *
Choline (from Bitartrate 500 mg)………………… 200 mg 36%
Inositol (from Inositol, Inositol Hexanicotinate)…… 100 mg *

Vitamin C Complex
Vitamin C (Magnesium Ascorbate)………………. 120 mg 444%
Mixed Citrus Bioflavonoids………………………. 100 mg *
Quercetin………………………………………… 65 mg *

Vitamin D3 (Cholecalciferol) ………………………….. 25 mcg 1000 IU 167%

Vitamin E Complex ……………………………………. 100 mg *
Tocopherols: 90 mg
alpha-tocopherol …………………………… 15 mg 22 IU 186%
beta-tocopherol …………………………….. 1.5 mg *
gamma-tocopherol………………………….. 52 mg *
delta-tocopherol…………………………….. 22 mg *
Tocotrienols: 10 mg *
alpha-tocotrienol …………………………… 3 mg *
beta-tocotrienol …………………………….. 0.1 mg *
gamma-tocotrienol …………………………. 6 mg *
delta-tocotrienol…………………………….. 1.3 mg *
Vitamin K2 (As Menatetrenone (MK-4))……………….. 500 mcg 416%

Minerals
Boron (Citrate)…………………………………………. 1.8 mg *
Calcium (Citrate-Malate, D-Glucarate)………………… 300 mg 30%
Chromium (Picolinate)………………………………….. 100 mcg *
Copper (Citrate)………………………………………… 1.5 mg 167%
Lithium (orotate)(in our USA formula)..... 1000 mcg *
Iodine (Potassium Iodide)……………………………… 150 mcg 100%
Magnesium (Citrate, Aspartate,
Oxide, Ascorbate, Chlorophyllin)……………… 210 mg 50%
Manganese (Glycinate)………………………………… 2.3 mg 100%
Molybdenum (Na Molybdate) ………………………… 45 mcg 100%
Selenium (Se-Methylselenocysteine) ………………….. 200 mcg 364%
Silicon (Na Metasilicate)……………………………….. 50 mg *
Strontium (Citrate)……………………………………… 1.5 mg *
Vanadium (Citrate)……………………………………... 18 mcg *
Zinc (Citrate)…………………………………………… 11 mg 100%

Biotransformation Conjugates
Acetic acid……………………………………………… 100 mg *
Glycine………………………………………………… 400 mg *
Taurine………………………………………………… 500 mg *
Trimethylglycine (TMG HCl)…………………………… 500 mg *
N-Acetylcysteine (NAC)……………………………….. 200 mg 10%*
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1 Get Smart tablet containing:
Vinpocetine 10 mg, Centrophenoxine 250 mg, Pyritinol 200 mg, Picamilon 100 mg, Aniracetam 200 mg, Oxiracetam 50 mg, Idebenone 10 mg, Galantamine 300 mcg, Huperzine A 100 mcg.
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300mg Alpha Lipoic Acid
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500mg Acetyl-L- Cartinine
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I also drink alot of white tea (not black tea with milk; the less processed form of green tea), which contains L-Theanine.

What are people's opinions on this stack, and are there any problems with it? I was also thinking of adding deprenyl to this, what do you think?

Suitable for basic needs. Whats your age? If under 25 I probably would not take deprenyl.

I'm only 18. Why is it that I shouldn't take it? Isn't prevention better than cure?

Your MAO B levels are still relatively low and deprenyl's actions would not provide you much benefit at this time. Deprenyl does not prevent any disease or condition.

Even if the MAO B levels are low would it get them even lower leaving to more Dopamine? And act like an anti-depressant/motivation enhancer?