DO NOT use Neodefend preservative (aka gluconolactone SB) with ascorbic acid (L-ascorbic acid; aka Vitamin C). The combination can product benzene, a known carcinogen.
According to lotioncrafter.com, the use of gluconolactone SB along with l-ascorbic acid and citric acid should be avoided
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Tips
Type 2 Collagen is the form used to improve the joints. Types 1 and 3 collagen are used to aid and improve hair and skin.
Types 1 and 3 are recommended to be taken separately, according to online sources.
If using 'bovine' collagen, be careful about it's source!