Could We Really Use Aloe vera Food Supplements to Treat Diabetes? Quality Control Issues

Figure 6

(a) ¹H NMR spectrum of AV-1. Notice the presence of benzoate (not listed in the product label) and methanol (toxic contaminant) characteristic peaks in this preparation

(b) ¹H NMR spectrum of AV-2. Notice the presence of benzoate (not listed in the product label) and methanol (toxic contaminant) characteristic peaks in this preparation as shown in Figure 6(a)

(c) ¹H NMR spectrum of AV-3. Notice the presence of benzoate (not listed in the product label) and absence of methanol from characteristic peaks described in Figure 6(a)

(d) ¹H NMR spectrum of AV-4. Notice the prominent presence of benzoate listed in the product label and absence of methanol from characteristic peaks described in Figure 6(a)