SENASA is a nightmare!
To the OP
While I absolutely applaud your enthusiasm, I think you are faced with several challenges. As Ghost said, getting anything approved for human consumption that you can sell, esp if you are claiming it has health benefits, would seem to me INCREDIBLY challenging.
If your business is dependent upon anything imported, you just hit a full stop. Seriously. You can't depend on anything clearing customs nor can you build a production around it when delivery times will vary from really long until never.
If you can do it with locally produced goods, you are in *slightly* better shape but will need to be vigilant about quality control and also again, expect that there will be delays in getting things done here and your suppliers will arbitrarily raise their prices.
I assume you have residency here. If not, you will need to get it or you will need a local partner as the director of your company needs to be a resident of Argentina.
You will need to set up a company - I would recommend an SRL. I would highly recommend you engage the services of an accounting firm as the tax laws here are subject to change frequently and *very* intensive on paper filings. You will spend more time paying the gov't than anything else. I assume you are aware the corp tax rate is 35% on any profits you have in addition to all the other standard taxes.
I also assume you will have employees. jajajajajaja - buckle up and prepare for a bumpy ride. Assuming you put them in blanco, you will need to arrange a medical exam for anyone prior to hiring. 13th month of salary is mandatory (payable in 2 installments, June & Dec). You will need to provide at a minimum obra social but most employees will want/expect private health insurance in any type of corp setting. 10 days of vacation is required after 1 year plus all the feriados here (I believe there are 15 this year?). Your employees are entitled to unlimited sick time. When they quit or you have to dismiss someone, it's a long process that i don't have time to explain in full but just know it's a nightmare. Your employees will expect 20% raises annually just for showing up.
If you do it en negro, you can save some but know that you will get sued sooner rather than later and you will pay out huge amounts in fines.
What else.....? Honestly, I opened a business here and the work quality was great but the paperwork, headaches, gov't interference, high taxes, inflation, etc made it impossible to grow it.
If I were you, and I'm not, I would be looking at Chile (the Chilean gov't is actually paying entrepenurs to open businesses there), Uruguay (much better banking system) or Brasil (better and more stable market albeit expensive). Argentina wouldn't even be on my radar.