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Q: How do these compare to GNC's Mega Men multivitamin?

GNC Charges much more, these are 150 per bottle for around $20 if you shop around, you can find sellers giving deals by buying 2 or more bottles, to cut costs even further, I never buy anything anymore from GNC< I use to work for them years ago and they hike up the prices more than anyone I've seen, I would rate these a bit higher without cost considerations, taking cost into it, these rank a lot higher.

Q: There have been some concerns about liver toxins associated with Chinese Spirulina. cf. nutritionfacts.org. Anyone know the source for this product?

Liver damage has been associated with sources of spirulina from various sources, not just Chinese, which are contaminated with similar but toxin producing organisms. The concentration of toxins these creatures produce varies highly depending on environmental conditions. Crit. Rev. Food Sci. Nut., 2011, 7, 51 In addition, the exact concentration of spirulina is not listed on the bottle. Listed is a "Men's Strengthening Blend" which consists of 100 mg of saw palmetto and spirulina. Risk can't be ruled out, regardless of source.

Q: Cyanocobalamin? It may contain organic fruits and vegetables, but it also contains synthetic forms of vitamins?

http://www.webmd.com/drugs/2/drug-1010/cyanocobalamin+%28vit+b-12%29+oral/details

Q: Is it Halal suitable, kosher suitable, suitable for vegetarian, suitable for vegans or none?

I contacted the manufacturer and it is NOT vegetarian/vegan. It contains lycopene, which is unfortunately stabilized using animal gelatin. TG's answer is wrong on this one. I'm not sure about the kosher/halal question, and would suggest that you contact Rainbow Light about those queries.