Aubrey's natural preservative

I'm thinking of trying my hand at making a few hair products for myself and have been reading threads on preservatives. It seems that the general consensus here is that vitamins a, c, and e and grapefruit seed extract are not real preservatives and don't adequately preserve water-based products. I noticed that Aubrey organics, whose products have a one-year shelf life, uses a preservative composed of these exact four ingredients. I've used several of their products and have never had an issue with spoilage. What's your take on Aubrey's preservative?
2B, normal porosity, elasticity, thickness, texture, moisture loving, protein leery...
Favorites:
CO: Whole Foods Lavender Conditioner
LO: Dessert Essence Coconut, Pure and Basic Clarifying Shampoo
RO: SSDDMT
DT: JCDCT, SSDDMT
Style: AOMM, CCCL, KMFUM, KCTT

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