Fig. 1From: Preparation of vitamin D3-loaded oil-in-water-in-oil double emulsions using psyllium gum: optimization using response surface methodologyVisual inspection of double emulsions at 100 × after production (a) and after 50 days of storage (b). The particle size distribution diagram of freshly produced double emulsion (c) and after 50 days of storage (d)Back to article page