Hi Selma,
hello all,
Among our ingredients there are the conservatives, such as sorbic acid and potasuim sorbate, logically there is no microbiological risks because they are Antimicrobial preservatives, fungistatic agents (www.fao.org/ag/agn/jecfa-additives) so there is no need to ask our supplier to provide us with microbiological data ?
and also Vitamins we are not receive the microbiological data, is it necessary ?
I originally interpreted the above query in two possible ways (a) to relate specifically to BRC7, Clause 3.6. This, together with clause 3.5 clearly (see quotes below) involves a series of (BCPA) knowledge requirements regarding Safety, Regulatory, Quality, (b) generic but oriented to Food Safety, more specifically, haccp.
Which interpretation was correct Selma ? If neither then what ??
I would also reiterate that you are the customer, not the supplier. IMEX proposed "specifications" from the two ends of the food manufacturing chain are commonly of different, err, "scope" and likely with numerical variations. 
If (a) -
Specifications for raw materials and packaging shall be adequate and accurate and ensure compliance with relevant safety and legislative requirements. The specifications shall include defined limits for relevant attributes of the material which may affect the quality or safety of the final products (e.g. chemical, microbiological or physical standards)
The above involves a series of ingredient knowledge requirements regarding Safety, Regulatory, Quality,Process context.
If (b) a generic answer is that the specification for items such as you refer should ensure that the ingredient is "Food Grade". (eg "safe to consume")
Unfortunately afaik there is no unique operational definition of "Food Grade". One answer often seen is that the specification should include "generic" requirements as listed in various recognised compilations such as the FCC, USP etc. Some narrower US examples of possible reference sources were included in Post 7.
If none of the suggestions such as above assist, another option is to consult a database of typical BCPA, FS hazards for the ingredients involved such as the Canadian or US compilations often linked to on this Forum.
Morocco may well have its own (Regulatory??) preferences in which case yr answer is, at least, Regulatory self-defined unless you are exporting.
Sometimes the answers provided in above options may differ either qualitatively/quantitatively or in their scope. If so, I tend to take the most conservative opinion unless there is a validatable reason to do otherwise. Just as an example of potential variations can see the 2 attachments in Post2.
Sometimes the feedback from above sources may IYO be visibly insufficient in which case some personal judgement (ie additions) may be further required. This is a case-by-case situation.
Personally i normally go through all the above mechanisms when confronted with a new ingredient such as you mention and compare the results. And yes, it takes time.
(TBH my first step is to do some Googling as per Post 2). I daresay other members have their own favorite procedures. Some retail customers IMEX have a formal on-line questionnaire system requiring inputs for a large range of standardised BCPA characteristics which are regarded as "essential". It's part of their legally oriented "due diligence" setup.
Interested to hear how you get on with yr 3 products in respect to routes such as the above.
PS - regarding yr comment of "heavy metals", IMEX this is a very frequent requirement of "Purity" specifications. For many historical reasons/disasters.
PPS - Regarding (a), the BRC7 clause 3.5.1.1 is also a major factor interlocking with the specification requirement -
The company shall undertake a documented risk assessment of each raw material or group of raw materials including packaging to identify potential risks to product safety, legality and quality. This shall take into account the potential for:
• allergen contamination
• foreign-body risks
• microbiological contamination
• chemical contamination
• substitution or fraud (see clause 5.4.2).
Consideration shall also be given to the signifi cance of a raw material to the quality of the fi nal product. The risk assessment shall form the basis for the raw material acceptance and testing procedure and for the processes adopted for supplier approval and monitoring. The risk assessments shall be reviewed at least annually.