What is the effect of nicotinic acid on human organism?

it is neutral
It is harmful, causes cancer
It is highly toxic, kills in 10 seconds
It is essential for functioning
Nicotinic acid, better known as niacin or vitamin B3, has nothing in common with tobacco. Chronic lack of niacin leads to pellagra, a vitamin deficiency disease.
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it is neutral
It is harmful, causes cancer
It is highly toxic, kills in 10 seconds
It is essential for functioning
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flagGreece
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16%
8%
60%
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25%
7%
59%
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4%
27%
13%
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53%
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39%
5%
49%
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6%
47%
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34%
12%
44%
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38%
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37%
72
flagRepublic of Ireland
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44%
16%
36%
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41%
10%
34%
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flagthe United Kingdom
4%
50%
11%
33%
209
flagPoland
4%
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12%
31%
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flagthe United States
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15%
27%
490
flagMalaysia
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37%
27%
27%
29
flagthe Netherlands
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38%
16%
27%
18
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50%
11%
26%
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flagIndia
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48%
21%
23%
531
flagSingapore
5%
70%
10%
15%
20
flagthe Philippines
12%
65%
9%
9%
41